tsh is thyroid test...it is done to check if baby has got thyroid... black colour poop is meconium, which is the first poop passed by baby, it was formed when baby was in tummy... baby should poop meconium within 48 hours... though normally it is passed in 24 hours and may last for 2-3 days

2-3 days.

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Aapka sawaal samajh <u>nai</u> aaya