Dr. Marc-Antoine Marquis – Pediatrician | Montréal, QC

Dr. Marc-Antoine Marquis is a dedicated Pediatrician committed to providing comprehensive and compassionate healthcare for infants, children, and adolescents. Practicing at CHU Sainte-Justine in Montréal, QC, he is an integral part of the local pediatric healthcare community. Adhering to the high standards set by the Collège des médecins du Québec (CMQ), he focuses on preventive care, well-child check-ups, immunizations, and the management of common childhood illnesses, promoting healthy growth and development from infancy through adolescence. His practice environment is thoughtfully designed to be welcoming and engaging for children, ensuring a positive experience for young patients and their families.

He holds a Medical Degree from a recognized institution and has accumulated over 7 years of experience as a Pediatrician since 2017. Dr. Marquis has completed extensive post-graduate training and possesses the necessary certifications to practice Pediatrics (Comprehensive care for infants, children, and adolescents) in Quebec. His qualifications reflect a strong commitment to maintaining the highest standards of pediatric medicine and ongoing professional development.

Driven by a family-centered philosophy, Dr. Marquis emphasizes evidence-based practice, preventive health strategies, and close collaboration with families and other healthcare professionals. He speaks French fluently and is dedicated to providing accessible, empathetic, and high-quality pediatric care to the communities in Montréal. His approach ensures that each child’s unique needs are met with warmth, expertise, and respect.

Dr. Marc-Antoine Marquis provides care for a wide range of childhood conditions, including:

Common General Pediatric Conditions

• Otitis Media (Ear Infections): Inflammation or infection of the middle ear, very common in young children.
• Gastroenteritis (Stomach Flu): Inflammation of the stomach and intestines, typically causing vomiting and diarrhea.
• Urinary Tract Infections (UTIs - uncomplicated): Bacterial infections affecting the urinary system, common in children.

Developmental & Behavioral Conditions

• Global Developmental Delay: Significant delays in two or more areas of development (e.g., motor, language, cognitive).
• Speech & Language Delays: Difficulties in understanding or using spoken language appropriate for a child's age.
• Anxiety & Mood Disorders in Children: Conditions like generalized anxiety, separation anxiety, or childhood depression affecting emotional well-being.

Adolescent Health Concerns

• Sports Injuries & Concussions: Injuries common in active teenagers, including head injuries requiring careful management.
• Adolescent Depression & Anxiety: Mental health challenges that can emerge or intensify during teenage years.
• Substance Use Issues (Screening & Brief Intervention): Addressing concerns related to alcohol, tobacco, or drug use in adolescents.

This list provides examples and is not exhaustive. For personalized advice, please discuss your child's specific situation with Dr. Marc-Antoine Marquis.

• Lead Exposure Risk Assessment & Screening: Evaluating risk factors for lead exposure and performing screening tests as indicated by guidelines.
• Vision & Hearing Screening: Basic screening tests to detect potential vision or hearing problems in children.
• Routine Immunizations & Vaccinations: Administering vaccines according to provincial immunization schedules to protect children from preventable diseases.
• Parental Guidance & Support: Providing education and support to parents on various aspects of child health, safety, behavior, and development.
• Nutritional Counseling & Weight Management for Children & Adolescents: Guidance on healthy eating habits, addressing nutritional deficiencies, and managing weight concerns in the pediatric population.
• Anticipatory Guidance for Injury Prevention: Educating families on age-specific safety measures to prevent common childhood injuries.
• Mental Health Screening & Initial Support: Basic screening for common pediatric mental health concerns (e.g., anxiety, depression) and providing initial support or referrals as needed.

Note: This list provides a general overview of services offered in Pediatrics (Comprehensive care for infants, children, and adolescents). Care plans are highly individualized to meet each child's specific health needs. Please discuss with Dr. Marquis or your healthcare team for details relevant to your child's care.

All medical services are provided in accordance with the standards of practice set by the Collège des médecins du Québec (CMQ) and relevant pediatric care guidelines. Contact the clinic regarding new patient intake and referral processes.

Dr. Marquis practices at CHU Sainte-Justine, located in Montréal's vibrant Côte-des-Neiges Central (UdeM area) neighborhood. The practice is conveniently situated near Alexis Nihon Plaza and the Downtown Shopping District, making it easy for families to visit. The facility is accessible via the Société de transport de Montréal (STM) network, including Métro and Bus routes, providing reliable public transit options. The practice is wheelchair accessible and strives to create a welcoming environment for children and families. Parking is available at or near the facility, ensuring convenience for patients arriving by car. The setting is designed to be family-friendly, with amenities that support a comfortable and positive experience for children of all ages.

Are pediatric services with Dr. Marquis covered by Régie de l'assurance maladie du Québec (RAMQ) in QC?

Medically necessary consultations, well-child visits, immunizations, and treatment for illnesses provided by a licensed Pediatrician like Dr. Marquis are generally covered by Régie de l'assurance maladie du Québec (RAMQ) in QC. Some specialized tests, procedures, or medications prescribed by a subspecialist may require pre-authorization or might have specific coverage criteria. It's always a good idea to confirm coverage details with Régie de l'assurance maladie du Québec (RAMQ) or Dr. Marquis's office, especially for subspecialty care.

Do I need a referral to see Dr. Marquis, a Pediatrician?

For a general Pediatrician, you may be able to book an appointment directly for your child, particularly if Dr. Marquis is accepting new patients or for newborn care. However, if Dr. Marquis is a pediatric subspecialist (e.g., a Pediatric Cardiologist or Developmental Pediatrician), a referral from your child's family doctor or a general pediatrician is usually required for services to be covered by Régie de l'assurance maladie du Québec (RAMQ). It's best to check with Dr. Marquis's clinic directly regarding their new patient and referral policies. you may be able to book an appointment directly, especially if the practice is accepting new patients, or for newborn care.

What can I expect during my child's first visit or a well-child visit with a Pediatrician?

During your child's first visit or a routine well-child check-up with Dr. Marquis, He will conduct a thorough physical examination, measure your child's growth (height, weight, head circumference for infants), and discuss developmental milestones. He will also review immunization records, talk about nutrition, sleep, safety, and behavior appropriate for your child's age. This is an excellent opportunity for you to ask any questions you have about your child's health or development. These visits are key to preventive care and building a strong relationship with your child's doctor.

When should I take my child to see Dr. Marquis if they are sick?

You should contact Dr. Marquis's office if your child has symptoms that concern you, such as a high or persistent fever (especially in infants), difficulty breathing or rapid breathing, signs of dehydration (e.g., dry mouth, few wet diapers), severe pain, vomiting or diarrhea that is persistent or severe, a rash you're unsure about, unusual lethargy or irritability, or if your child just doesn't seem like themselves. The clinic staff can help determine if your child needs to be seen and how soon. For emergencies, always go to the nearest emergency department or call 911.

What can I do if my child is having trouble sleeping?

Sleep is crucial for a child's development. If your child is having trouble sleeping, establishing a consistent bedtime routine is very important. This includes a calming wind-down period, a set bedtime, and ensuring their sleep environment is comfortable, dark, and quiet. Limiting screen time before bed can also help. Dr. Marquis can discuss age-appropriate sleep needs, common sleep problems, and strategies to address them. Sometimes, underlying issues like anxiety or medical conditions can affect sleep, which Dr. Marquis can help assess.

What should I do if my child gets sick after Dr. Marquis's office is closed?

Dr. Marquis's office will usually have instructions for after-hours care. This might involve a phone number for an on-call physician or nurse line, directions to a pediatric after-hours clinic, or advice on when to go to an urgent care center or emergency department. It's a good idea to ask about these procedures during a regular visit. For life-threatening emergencies, always call 911 or go to the nearest emergency room immediately.

CHU Sainte-Justine
3175 ch de la Côte-Sainte-Catherine
Montréal, QC H3T 1C5

Phone: (514) 345-4931

The facility is wheelchair accessible and aims to be welcoming to children and families.

Dr. Marquis is a licensed Pediatrician regulated by the Collège des médecins du Québec (CMQ) under the Medical Act in QC. Dr. Marquis may accept new patients directly for general pediatric care or via referral, depending on clinic policy. Please contact the clinic for information on new patient registration and any referral requirements for services covered by the provincial health plan.

Verify registration with the Collège des médecins du Québec (CMQ): https://www.cmq.org/en/directory/physicians?number=17568