Hopefully I can explain myself more..
I am very on the fence about having a sibling for my DD (3) and realised that, in the (brief) moments I feel broody, I actually just feel broody for how my DD was as a baby. I would give anything to go back and experience her as a baby again, the good the bad and the ugly. And as annoying and corny as it sounds, just appreciate it more. I spent the first year of her life just surviving.
I told my DH this and I can tell he didn't really get it - and likely thinks it's just be being broody for another baby. But I don't think it is?