We have 3 - eldest is just turned 4, middle is 18m and youngest is 3m.
We always planned 3, and originally intended to try for just what we have got so feel very lucky lol. We had though changed plans slightly to go for another 2+year gap as we liked that gap a lot with the first 2. However, 3rd had other ideas and arrived 15m after second lol.
We're 99% sure we're done. I have the odd moment where I think about adding a 4th, but then the practicalities start to kick in, and my health isn't the best, and we can provide well for our family as is....plus we always said 3, it's just a bit sad that it's 'over' so to speak.
Believe it or not, if we'd had a smaller gap to begin with I reckon we would have gone for a small gap again. It's nice to have 'babies' together tbh, and I do feel a bit sorry for my eldest at times as the babies are much higher maintenance than he is and I often have to force nice things upon him as he's in a different stage altogether lol.