If the babies have morning naps, it is great because then you can spend that time doing activities geared to the older ones. That's what I am doing now and it is working really well. And actually, aside from the first weeks of adjustment, I find the babies actually need less attention than the toddlers and preschoolers. The entertain themselves quite easily while the older ones seem to always be doing something that needs my attention or wanting me to read to them, play with them, etc. Honestly, my two that are under 1 are the easiest of the whole group