I can only speak for my experience, but I had 3 years in between my number two and three. I don't think it is so much the age gap that is an issue, but the workload that increases from two to three. From one child to two, there is definately an increase, but from two to three children the difference is huge. I'm sure people that have three children or more will tell you that three children doubles the workload from two. All of a sudden you only have two hands and three kids and the extra washing, food preparation, seatbelts and extra stuff in the house is surprisingly different. Even going from three to four, was less impacting than going from two to three, for me. I think that once you have three, four or more is not much different! I need to wash every day, cook meals ahead of time and freeze them etc to really stay on top. I have to have a great organization system in place at home and be totally prepared the night before to go out the next day. This is different for me, though, because I have one in school and one in preschool. The school runs every day can be pretty full-on. It was my motto, when planning my next baby, that we were ready for another one as soon as we didn't have to visit the baby aisle in the supermarket anymore. When the youngest didn't wear nappies or need baby food etc anymore - we would go again!! That is until number four surprised us, less than two years after number three. I have said in previous posts, though, that I can see the benefit of having them close together before your eldest needs to go to school. A toddler and baby, doing the school run, scheduling feeds and sleep times,and chasing two year olds is not much fun. Good luck whatever you decide - I say give it a lot of thought about the future and do what you feel is right. (Of course Hubby has to be on board with your decision too!)
Domestic Goddess Mum of Four!