Infant care kids may be independent a little faster? But they may also fall sick more due to being around other kids? And babies looked after by parents/grandparents may be closer to the family (debatable but I feel so, since my husband looks after my kids full time). There’s also a structured schedule at the IFC compared to your folks looking after baby, and they’ll follow the general baby care guidelines.. which some folks don’t (causes some parents to get into conflict with the grandparents). Think at the end of the day, it depends on what you’re comfortable with and whether you’re happy with the way your folks raise your baby, whether they’re even able to in the first place, and of course financial considerations