We have two kids. One is 3, and the other is 1. Our first was an amazing sleeper. After the first few months, she would mostly sleep in a basinet the entire nig

We have two kids. One is 3, and the other is 1. Our first was an amazing sleeper. After the first few months, she would mostly sleep in a basinet the entire night. She transitioned to a crib easily, and now sleeps in a bed for about 12 hours per night without getting up. Our second on the other hand was a complete nightmare. Crying for almost the entire night for months on end. He eventually settled down a bit, but we finally caved and let him co-sleep. He slept with us for almost the entire first year, and is just now moving to a crib. So I don't even think it's genetic. It's almost purely random.