My hubbies biggest thing is the sleep deprivation. We usually have about 18-24 months till the baby sleeps thru fault consistently. So he thinks if we go again in another say 15 months then by the time our youngest is sleeping well, our eldest will be nine..... I the one who gets up over night unless I have a baby feeding at the breast and an older one calls out. But I guess cos Eddie has been harder, he has struggled more this time