Lol same for me! I know my kids were both big when they were born (DD 9lp5.5oz, 53cm and DS 10lp5oz, 53cm) but they did actually fit into 0000 for two weeks. I'm not sure how long until DD was into 00, but going through her old clothes to sell today, some of her 00 clothes had name labels, so she wore them to daycare at 9 months old. Then there's DS, who is not fitting some of his smaller 000 (mostly thanks to his bulky nappies) and today looked perfect in a 00 suit! He's only 6 weeks old!!