Our little man is growing so fast. When he was just 9 weeks old, he wore his first 00 outfit. His body is still bigger than his legs haha. His infant nappies were getting too small at this age too but the next size up in the Huggies nappies are too big. We eventually transitioned him to Coles Comfy Bots infant size before using the Crawlers because they seem a little bit bigger and fit better for now.