Why do they make baby undershirts with that little flap? Is it absolutely necessary? My friend's daughter is 2 and she still has them on hers. What the heck are they for? The surely don't hold urine when a diaper has overflowed...
I'm assuming that the "flap" you mean is the bottom of a onsie. They reason they are like that is because a normal t-shirt would rise up and show off the belly and/or bottom of the baby. They aren't supposed to hold the pee or the poop. That's what a diaper is for. But they cover the diaper and possible keep the shirt tucked into any pants or whatnot the baby might wear over the onsie. They snap like that so that the parents can easily change the diaper under the onsie.
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Does that help?
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