This is Cooper, a crested Cayuga x Khaki Campbell-Cayuga mixed duckling. She's 2 weeks old. Her 2 hatch mates are not crested (mom is crested). Ever since they hatched, the other 2 have been growing at a typical pace. Cooper has stayed small and is a bit chunky shaped. She's almost half their size. However, she has always acted and eaten normally. Underneath her crest, it feels as if her skull has not fully closed. The soft spot feels as if it's getting smaller though. What is going on? Is this normal?