I have 3, aged 7, 4 and 15 months.
I feel as though the baby set us back several years. I've just had the eldest two during the school holidays and it feels so easy with a 7 and 4 year old. There's so many things we can do together and they don't need me all the time, the way a toddler does. It just feels more relaxed. The toddler limits what we can and I feel spread quite thinly between each child.
Logistically, hotel rooms for 5 are hard to come by and/or v v expensive.
Another lot of childcare to pay out and the most basic of days out gets ££££.
Getting everyone in and out the car is a mission!
I love them all dearly and their bond is amazing, there's so much fun and laughter, although they do wind each other up and it's always noisy.
I wouldn't say I regret having a third but it is definitely 'a lot' and there's times where I am a little wistful for how much easier, cheaper and simpler life would have been as a family of 4.