Dd1 was a premmie, she started in 000000 and was in 0000 for about three months, she was in 000 for over a year!

Dd2 was in 000 two weeks after she was born, mostly because of her length. She was in 00 for about 8 months.

Ds was a fast grower he spent a few weeks each in 0000 and 000, a couple of months each in 00 and 0. By 10 months he was well and truly getting into 1's, but he is still in ones now at 16 months.