She now is on a desiccated porcine
thyroid replacement which has both t3 and t4
in it. Most
babies, as mine was, are usually only on Synthroid and they do well with this. Your babies TSH should be decreasing and not increasing .I agree that if this continues to rise then you will need to take your son to a pediatric endocrinologist for further blood testing tio check the actual thyroid hormone levels (free t3 and free t4).