Why do clefts happen?
We don’t know exactly why they happen, but we know that the lip, nose and the gum form at 5-6 weeks gestation and the palate forms at 7-8 weeks and for some reason this process may fail completely or be interrupted at any stage. This produces a variety of incomplete, unilateral and bilateral clefts that make up the 1 in 700 babies born every year with this diagnosis.