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Pediatrics/thyroxine and the newborn


good day dr, may i know what are the effects to the newborn if his mother is on thyroxine medication 100-150mcg daily?

Hi Claire,

Thyroxine is natural hormone and is given to any patient to correct the deficient levels in her/ his body (hypothyroidism). Dose is adjusted according to the levels (lab tests: T3/T4 TSH)

Being a natural hormone, it does not have any adverse effects on the newborn of hypothyroid mother.

The only effects are POSITIVE, as it keeps newborn's mother healthy!!

PLEASE NOTE: The requirement of thyroxine is higher (by about 50%) during pregnancy, and the requirement is gradually decreased after pregnancy. It is very important fr mother to remain in touch with her doctor and get the tests as recommended, as dose usually has to be reduced, based on the lab reports.

Best wishes,
Dr. Puneet Kumar,
Kumar Child Clinic, Dwarka,
New Delhi, India



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Dr. Puneet Kumar


I would be happy to answer general queries on prevention and treatment of ailments in newborn, infant, toddler, child or an adolescent. Needless to say, it will not be possible to answer any query requiring specific diagnosis of a particular subject.


I have worked in various capacities (medical officer, resident, senior resident, consultant) in public as well as private sector in Pediatrics and Neonatology. Today, I have over 15 years of experience in the field.

Currently, I am running my own clinic (Kumar Child Clinic) in Dwarka, New Delhi and am attached to Lifeline Hospital, Dwarka as consultant pediatrics and neonatology. I am also developing my clinic website into a comprehensive child health/ parenting website (

(a) Chapter "National Immunization Schedule" in Frontiers of Social Pediatrics, Jaypee Publishers: 2nd edition, 2016. (b) Article, "All about Pertussis vaccines" in special issue of Indian Journal of Practical Pediatrics, October 2015 (c) Three chapters (DTP vaccines, Pneumococcal vaccines and Poliovirus vaccines) in "Textbook of Pediatrics for Post-graduates" First edition: 2015. (c) Chapter: "Alternative delivery methods of vaccines" in IAP textbook of Vaccines, First edition, 2014 (published by IAP/ Jaypee Brothers) (d) Special Article: "50 years of Immunization in India: Progress and Future" in January 2013 issue of Indian Pediatrics (e) Four chapters in "FAQ: Book on Vaccines and Immunization Practices" First edition, 2011 AND 2nd edition, 2015 published by Jaypee Brothers. (f) Three articles in special issue of Journal of Pediatric Sciences on “Controversies and Challenges in Pediatric Vaccination Today" in Sept, 2010. Co-edited the series also. (f) Regular column, “How do I treat” in Pediascene ( (g) Review article, “Role of Anti-Poliovirus Agents in Polio eradication and beyond” in Polio Pulse, April, 2008. (h) Chapter on “Acute Infectious Diarrhea” in Textbook of Infectious Diseases in Children. (An IAP Publication), 2007. 2nd edition in 2011. (i) Book-Review (IAP Pediatric Drug Formulary, 2004) in Pediascene, March 2005 ( ) (j) Case-report on Osteopetrosis. Jharkhand Journal of Pediatrics, Dec-2002.

After MBBS, I have done DNB residency in Pediatrics.

Awards and Honors
Winner of IAP practising pediatrician's quiz in 2001.

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