IF they care for their babies properly, you may not have to hand feed, it's just in case if you need to, you need to understand how! Different breeders pulls babies at different ages, I tend to pull at 14 days, but earlier if I must. But the younger they are, they more frequent you must feed. So it is wise to keep a hatch sheet so you know when they hatched exactly. Since you had no idea when the other ones hatch, find out if the last egg would hatch out tomorrow or the day afterwards, that would give you an idea with the approximate age of the other siblings. Usually hatch every other day so if the fourth egg hatches tomorrow, I'm still on the 29th even though it's near 3 am on the 30th, but you get the point, anyway so it would be the 30th the last baby hatch so you count backwards making the first baby hatched out on the 24th, second 26th, and third on the 28th. That is guess estimate as some chicks can hatch on the same day or hatch a day apart. But usually what I told you prior is usually what happens by the every other day hatching time. You can usually tell which one is older by their size differences. Feeding a newly hatch chick is a tiring process trust me....lol.....