When is a baby considered a month old? (Debate with hubby)

Kristina • mommy to 3 healthy boys. Hunter 5.7.13, Eli 7.29.18 and Jenson 6.28.20

This is a debate with my husband. He thinks baby is a month at 4 weeks I think it’s a month after birth. Ex born 7/29 baby will be a month on 8/29. Would just like to see what everyone else thinks.

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