Bek - I'm not a fan of those either. I much prefer the Bonds suits.

I think I'd be asking your mum for the receipt and explaining to her while you truly appreciate the gesture, you are concerned that the fabric won't breathe and a little baby might overheat in them??

Having said that, I have put them on my kids in winter overnight, but they only had one or two each and were 6m+ when they wore them.