Growth, hormones & puberty
Pediatric Endocrinology on the Upper East Side
Two Mount Sinai-trained pediatric endocrinologists for growth, thyroid, puberty, and weight concerns, in the same office as your pediatrician.
Most families wait months for a pediatric endocrinology appointment at a hospital. At Uptown Pediatrics, Dr. Michelle Klein and Dr. Vickie Wu both completed pediatric endocrinology fellowships at Mount Sinai and see patients right here on the Upper East Side. They work closely with your child’s pediatrician to evaluate concerns, explain what’s going on, and develop thoughtful, individualized treatment plans with your family.
Both doctors have extensive clinical expertise in pediatric endocrinology, have published articles in the field, and are members of several professional pediatric endocrinology societies.
Dr. Klein’s areas of expertise include growth, thyroid disease, children born small for gestational age, and pubertal development. She is also the recipient of the Arnold Gold Humanism in Medicine Teaching Award.
Dr. Wu’s areas of expertise include growth, precocious puberty, thyroid disease, and obesity. She is committed to helping children and families navigate these concerns with personalized, evidence-based care.
What we offer
Growth & short stature
Growth curve review, bone age, lab work, and growth hormone evaluation.
Growth hormone stimulation testing
A 3-hour in-office test with a single IV line. We'll walk you through every step.
Thyroid disease
Hypothyroidism, hyperthyroidism, thyroid nodules, and abnormal thyroid labs.
Early or late puberty
Evaluation and treatment of precocious and delayed puberty.
Small for gestational age
Follow-up for children born small who need help catching up.
Weight & metabolic health
Family-centered support for obesity, insulin resistance, and related concerns.
When to consider a visit
- Your child is growing much more slowly than peers or crossing down growth curve lines
- Signs of puberty before age 8 in girls or 9 in boys
- No signs of puberty by 13 in girls or 14 in boys
- Abnormal thyroid labs, or a family history of thyroid disease with symptoms
- Your child is overweight or obese
Questions about pediatric endocrinology
Do I need a referral to see your pediatric endocrinologists?
Current patients can simply ask their pediatrician. If your insurance requires a referral for specialty visits, call us at 212-427-0540 and we'll help you sort it out.
How do I prepare for a growth hormone stimulation test?
Nothing to eat or drink after midnight, bring the two medications called in to your pharmacy, a snack for afterward, and something to keep your child busy. Our growth hormone test page has the full checklist.
Your pediatric endocrinology team
Michelle L. Klein, MD
Pediatrics · Pediatric Endocrinology
In the office Tue · Wed · Fri
Fellowship-trained pediatric endocrinologist focused on growth, thyroid disease, and pubertal development.
Meet Dr. Klein
Vickie Wu, MD
Pediatrics · Pediatric Endocrinology
In the office Mon · Tue · Thu
Native New Yorker and Mount Sinai-trained pediatric endocrinologist with interests in growth, precocious puberty, and obesity.
Meet Dr. WuMore care at Uptown Pediatrics
Birth through adolescence
Pediatric Primary Care
Checkups, vaccines, and same-day sick visits with pediatricians who get to know your family for years.
Learn more
The first weeks
Newborn Care & Lactation Support
A whole newborn and lactation team: prenatal visits, Mount Sinai nursery rounds, a separate newborn waiting area, and in-office breastfeeding help from Nurse Mesi.
Learn more
Teens & young adults
Adolescent Medicine
Confidential, respectful care for teenagers from a fellowship-trained adolescent medicine specialist, with mental health support from our in-house psychiatrist.
Learn moreReady to join the Uptown Pediatrics family?
We welcome new patients from newborns to teens.
New to Uptown Pediatrics
Email us to become a patient
Tell us your child's age and insurance, and we'll get back to you to set up a first visit.
Email ushello@upnyc.pcc.com · Please leave out symptoms and medical details.
Already a patient
Message us in the patient portal
Send us a message to set up a checkup or follow-up, or to ask your doctor a question. You can also see records there.
Message usSick today? Call for a same-day appointment, or just stop by weekdays 9:30-3.
Prefer to talk? Call us at 212-427-0540