I think when someone has 3 kids that it's nice when they do it because I honestly mix their kids up sometimes. If there is a far out spacing I don't. My nephews are all very close in age and Dh will ask me all the time which one is which in pics.
I like it too but definitely won't do it this year. This is literally the first time I've given thought to when I would do it but I suppose I'd start when the last kid* is 3 or so?
I feel like with my friends who have kids that are 3+, their pregnancies/deliveries are fuzzy to me so I'd appreciate an age.
* This is because I'll only have two, three years apart.