When I had just had my son I was pleased to be given lovely dungarees for a one year old. Everyone gets babygros, which is great, they will use a lot, but putting him into those dungarees was really nice.
A small soft toy is always a good thing for new babies. Something animal-like and very soft that they can easily grip. Just don't be offended if the baby doesn't take to it - babies are just small people with their own idea of what they like and what they don't like. We bought a baby such a toy 2 or 3 years ago and it turned out to be the favourite toy that it took everywhere; it could just as easily have been a complete flop.
A treasure box.... a lockable box or tin for the family to collect things like photos, baby teeth, first lock of hair etc. I always bought them for friends but started them off with a few items I thought were nice. Like guardian angel charms, a witch stone for protection
( a pebble with a hole through it) a tiny photo frame, things left me that.
Another option might be a gift card for a photographer. Pro photos are nice things to have later on.
A token gift of flowers I think....something ready arranged or a planted pot so no need to do anything except plonk them down somewhere and admire. Some places do a deal where you can add a teddy to the flowers for an extra sum. If the baby has older sibs then gifts for the older sibs seem to go down well.
I think I’ll go down the flowers and Prosecco route for the mums to celebrate their achievement, will keep an eye out for something for the little one though.