I fell pregnant when my firstborn was 18 months old. Found it a bit tough to be both pregnant and breastfeeding, and I wish I'd kind of been able to have break between the two, but the trade off would have been a bigger age gap and I didn't want that. That was about the only downfall from my perspective. The age gap was good because our firstborn was able to handle the arrival of a sibling really well and he was also at an age where he was quite accepting of daddy taking over as his main carer while mummy had to tend to a newborn. A couple of friends have the same age gap and also feel that it's very good. The firstborn is mature enough and grown out of being the baby by the time the second one arrives, but they're close enough in age that they play together well & get on like a house on fire (all three cases are same sex siblings, don't know if that makes a difference).

There's no perfect age gap though. There are pros and cons of both big & small age gaps and I think once you have the second, most people feel like the age gap they have is perfect for their family, which, of course, it is

Goodluck in deciding.. I umm and ahhhed for ages over this one.