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- A cleft occurs during the 4th to the 8th week of pregnancy
- Some clefts are caused by environmental factors, others by genetics
- Fathers, as well as mothers, can pass on genes that cause clefts
- Most cleft-affected babies are boys. However, it is not uncommon for a girl to be born with a cleft
- A person (male or female) born with a cleft that has no obvious cause has a greater chance of having a child with a cleft (1:700)
- Women who ingest too much Vitamin A and not enough folic acid are more likely to have children with a cleft
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