To be honest I think there are challenges regardless of the age gap between children, every age gap is going to have it's challenges they just vary in what they are. My first 2 are only 18 months apart, and while yes it was difficult, like the others have said if I could go back in time I wouldnt change it. I think life with a NB in the house is difficult no matter how old your other children are. I think if you go into it with eyes wide open and lots of support around it will be fine. You have to do what is right for yourself and your family.