Question

What is the impact on the baby if mother has high TSH during pregnancy

Answer 1

hmm, some research has pointed to some 'harsh' results. i.e
maternal hypothyroidism may lead to irreparable and detrimental deficits in the neurocognitive development of the fetus.
http://www.ncbi.nlm.nih.gov/pubmed/21719373
a good article for reviewal information.

Answer 2

hope this is enough to satisfy your question.