Your daughter was diagnosed with congenital hypothyroidism
for which treatment was started appropriately. At present her TSH
is low and T4 is high. This means that the dose of thyroxine
she is receiving is higher than what she requires. You can reduce the dose to 25 microgram per day and repeat TSH and free T4 after 5 weeks. If the TSH levels still do not increase and T4 levels continue to be high, you should consult a paediatric endocrinologist
Also I need to know a few more details regarding the growth and development of your child to help you better.
1) How old is she now?
2) What was her birth weight
and present weight ?
3) If you can tell me her head circumference?
4) Does she fix & follow objects, does she turn to sound, does she smile meaningfully when you interact with her?
Hope this change of dose works.