When I came home from the hospital with ds2 I looked down at my first born and didn't recognize him. Ds1 had overnight magically turned into a big kid and was no longer my baby. I don't know how the transformation happened but I thought it might have had something to do with the fact that he was almost 3 and was in fact not a baby but I talked to other moms and they all agree that the same thing happened to their first borns when the second came home.
So cuddle those "babies" extra hard the next few weeks because they are about to transform before your very eyes.
Re: PSA from a soon to be third time mom to the soon to be seconds
My advice is give yourself a break, however you feel is how you feel.