When are the wonder weeks? AS in what weeks do they occur?

This generally depends on the individual baby. There are all sorts of factors which influence babies’ development. Genetics, environment, gender, prematurity, siblings – the list is endless. But on average, give or take a week or two, the following ages are suggested as when Wonder Weeks happen: 5 weeks 8 weeks 12 weeks 17 weeks 26 weeks 36 weeks 44 weeks 53 weeks