Not giving baby a blanket or quilt to sleep under

Our GCs didn’t have bedding, but slept in a sort of half top, half quilted bag. They have a product name that I can’t remember, but they did have a TOG rating. Maybe the baby is getting chilly, you could buy a higher rated one as a lovely present from Granny. I think John Lewis sell them.

Wouldn’t be my way ( even as an adult) but it’s not your baby to comment on and if she’s done it 20 months must be ok and she’s fine …up to daughter in law and son I m glad your son doesn’t disagree with your daughter in law why would he ? would you like him to ?

I’ve never heard of this idea my 3 year old grandson has always had his blanky that is a soft blue one he takes around with him and so has my other six grandkids, but like others have said best to say nothing

I think that current best advice is no bedding in cribs.

Try to trust that your DIL is doing the best for her child

It's very common. My grandson didn't have covers when he was smaller. He's two and a half now. It hasn't done him any harm. You obviously dont like your Dil and her methods but it's her baby, not yours. I would recommend saying nothing. Times change.