My DD was 3 months old when I felt pregnant with #2. Don't know what its like having two yet, but I am finding pregnancy with a small baby quite difficult. I'm 5 months now and am finding it difficult in that DD is getting heavier (I think by the day!) and so I am really struggling with back and pelvic pain trying to hold her and support an increasingly large belly, whereas I didn't have any problems when pregnant with DD. Also geting up stairs to DD's room with her in my arms is tough, getting up off the floor with her etc. I hope its all going to be worth it though when I have two little girls so close together in age, and hopefully they will have a really close relationship.