A bit different for me as my children are younger. My oldest was 2 when DS2 was brong and 3 (1 month off being 4) when DD was born. My thoughts were that if i make the baby something that they can't touch, hold, look at or even help out with then it could magnify any jealousy issues. So i did my best within reason to allow what they wanted but always supervised. With your girls just make it quite clear that there is no holding without supervision right from day one. Have rules and allowances and no negociating what you are and aren't comfortable with. Also in my expereince (also again with younger ones) that if they ask for a hold i would lay the little one in their arms once there were sitting comfy (ensuring safety etc) and 2 seconds later they'd be ok you can take him/her now

I hope your dreams ease off soon for you. I'm sure your little one will be just fine

I think a good safety measure to stick with is you dont' have to be there right on top of them all the time but never take your eyes off them and what is happening. Eg in situations where they could pick bub up and possibly drop her. If it helps at all when i was 4ish and my brother probably 2ish i tried to get him out of his cot and dropped him And he's perfectly fine

Oh and DS2 loved to lie on DD and squash her, i had to always be watching him but again she has survived that fine.

All the best for learning to be a family of 5 xo