When my lo is sitting down his tummy is like a ball .. and my family been telling me is because the diaper is too tight. But I try to release it not that tight still same.. why is that so?

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Mommy nothing is wrong. Like the mom above mentioned babies look like balls on the whole. Ahahaha

It's normal. Babies their tummies all look like balls. :)

It's normal! that's the baby fats!