Which of the following thyroid hormones normally peak at 24 to 36 hours post-delivery in a newborn and gradually fall over the first 4 weeks of life?

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Within 30 to 60 minutes of delivery, TSH surges and then settles to 6 to 10 U/L by 1 week of age.The TSH surge stimulates thyroidal T₄ secretion, and total T₄, fT₄, and T₃ peak at 24 to 36 hours post-delivery and then gradually fall over the first 4 weeks of life.

Which of the Following Thyroid Hormones Normally Peak at 24