I’m not sure where to post this

It took my aunt 10 years to have a baby so she’s really protective of her son. She won’t put him on the floor for tummy time because she’s scared of germs, it’s a new development that she’ll even put him on his stomach at all. He’s over one year old and barely has the strength to hold his head up (he can for a couple seconds) let alone crawl or walk and she’s still not encouraging his development. Now she thinks that there’s something medically wrong with him because he can’t move. He can’t even hold a bottle by himself because she insists on doing it for him every time. Is it any of my business to interject and tell her that she’s delaying his development? I don’t want to hurt her feelings, but no one else is saying anything

Edit- she lives in a different country most of the time. I’m not sure about the pediatric system there but as far as I know no doctor has said anything to her