My DD1 was there, but at six is a fair bit older. We read books together and YouTube videos too. Having her there was important to us, but I did offload her for most of the day while I was in early labour (to a friend nearby, we had asked beforehand) and we had to make her around midnight for the birth itself.

In my HB group there are others who've had littlies at the birth. Most play it by ear and have a contingency plan if they decide they need it (I also thought if we needed to transfer we should have a back up). My Mum was here too JIC.