I’m tired of how people treat big babies/kids

I’m starting to get really tired of how people treat my big baby. My husbands family specifically acts as though he’s a giant. He is not a small baby, I get that. He has always been big. He’s 5 months old and wears a size 9-12 month in baby clothes and weighs as much as his 1 year old cousin. But they treat him like there’s something wrong with him when he’s completely normal. They criticize him missing milestones even though they’re not age appropriate (why can’t he sit up, why isn’t he crawling). They joke about his size and weight constantly, like calling him gordito is one thing but constantly pinching him and making comments about his body (not in a loving way) is just mean. And somehow they are shocked he’s not eating solids! I had to tell them several times the last time we visited he can’t have chips, you can’t give him rice, no baby snacks. I feel like they’re pressuring him to grow up and “act his size”.

The annoying thing is, they’re all big/tall too! My husband is 6ft, so are his aunt, grandpa, uncle and mom. My little brother in law (who’s 13) and a male cousin are both 6’5 and another male cousin is 6’7. They act like he’s some sort of wild anomaly when he fits right it with the rest of them. It’s so stupid and I hate when people won’t let kids be kids. They did the same thing to my poor little brother in law, joke about his weight, body, diet, everything even though he’s just a kid.

I just wish kids biggest haters weren’t their family members.