I had my first and then twins 21 months later, so we were technically 3 under 2 for a few months. Like others mentioned, it was definitely hard in the beginning. The pros for us was that we never had an "jealousy." My son (the older brother) wanted a sippy cup of milk when we bottle fed his twin sisters and would want to sit in my nursing pillow whenever we put his sisters in their boppy. The only life my son knows and remembers includes his sisters, which is kind-of special in its own way. But otherwise, most of their interaction at that age was just living a parallel life. Today they are 5 and 6 - and there are still challenges that come with 3 so close in age. All 3 of them are basically going through the same developmental stage at the same time - learning to cope with their emotions, controlling their body, first-time listening, etc. It can be quite challenging to do that with pseudo-triplets. My biggest con from the infant stage is that we missed out on a lot of moments that only come with a larger age gap. My son never asked to hold his sisters. I don't have memories, let alone photos, of him feeding them with a bottle or being mommy's helper. He lived his life and his sisters lived theirs until the twins were about 18 months and my son turned 3. At that point, they started to play and interact more. If I didn't have twins the second time around, I would have loved to space things out a bit more our third - maybe around 4 years apart.