Until a few months ago it was working out REALLY well to have my kids be 21 months apart - but they have had back to back colds since we started going to the ymca in the mornings a few months ago and the cold season started then my DD started p/t nursery school and it got worse! Back to back colds, one is better but the other one starts then the other gets it. It's constant. I honestly am going crazy - you know a 1 yr old and almost 3 yr old are not exactly nice to eachother when they don't feel well and I am exhausted. I can't even pamper them and be a comforting Mom because they're just wild misbehaving monkeys!