How or would hypothyroidism during pregnancy affect the baby later on?

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I found out I have hypothyroidism on July 14th. I think it started during my pregnancy (I had excessive swelling without preclampsia, was exhausted the whole time, and gained 20 lbs in ONE month).
Would/could anything happen to my son if it did happen during my pregnancy and was untreated until now? He’s almost 6 months old.
Developmental as in rolling and sitting?

It’s really common for moms to be disnosged after their baby’s birth. If wouldn’t hurt the baby if you had been hyperthydism is your late pregnancy.
I have had hypo since I was 7. My son is actually ahead developmentally, so I wouldnt worry.
or you may have postpartum thyroiditis
can happen within a year after birth and can clear up or it may not
http://en.wikipedia.org/wiki/Hypothyroidism
hypothyroidism untreated in pregnancies is sometimes linked to slight developmental delay after birth
this is what i found\
http://www.medicinenet.com/hypothyroidism_during_pregnancy/page2.htm