Wondering if I wasn't sufficiently on the ball here. DD is five months old and at a bit of a nosy stage. Everything gets a good stare/prod/suck. Met up with our friends earlier and they have a similar age baby. They popped theirs down right next to DD on a playmat so I presumed they didn't mind for the babies to be quite close. Both babies gave each other a bit of a stroke and DD seemed particularly excited, touching the other baby's face, hands etc. and kicking her legs a lot. At first everyone was saying it was sweet that they were interacting but I could sense the mum was a little on edge, particularly with DD sucking on her own fingers a lot. Whenever I saw DD putting her hands to the other baby's mouth or putting the baby's hands to her own mouth I would move DD's hand but I wondered if I was a bit slow there. It also sounded like DD put her fingers near the other baby's eyes when I was looking away.
What generally are people comfortable with when it comes to babies interacting with each other? The other baby seemed perfectly fine otherwise I would have intervened a bit quicker but maybe hands/faces are a particular no go?