M.D.
We got preggers with #2 when my first was 1 year old. They are 22 months apart (both boys) are are GREAT together. When #2 was born we made sure to include our oldest in everything. He had his own baby we got him and he would take real bottles, bibs and blankets and do everything mommy was doing. Today they are 6 and 4 and it is so awesome. They play together ALL the time, sleep together...they do everything together. Although my 4yo thinks he is 6...LOL
If I had it to do all over again I would do it exactly the same. We just had #3 and SHE is about 3-1/2 years younger. It is great because the boys are busy with each other and it allows me bonding time while she is an infant.