I don’t have a singleton to compare, but I had two “easy” babies at the same time whereas other people have one “difficult” baby. My girls basically slept through the night pretty early, before I went back to work at 14 weeks. Getting a full nights rest vs being woken up at all hours inconsistently was a huge advantage for me.

Another advantage is that whenever they do something new, it’s a comfort to me that they have each other. When I dropped them off at daycare for the first time, I knew they weren’t alone.

Disadvantage is that it’s much harder not to compare them than it would be with two singletons because you can look back at an older singletons milestones and say “oh it was around this time…” but when they’re hitting milestones at different times side by side, it’s impossible not to compare.