Deficiency of B vitamins and folic acid in maternal diet is another commonly associated cause of cleft lip and palate in the new born.
Parents who are older than usual at the time of birth of their baby are at higher risk of having children with cleft lip and or palate.
A viral infection during pregnancy may also be associated with cleft lip and palate. Mothers who are obese have a higher chance of their child being born with a cleft. ~Source
B group vitamins including folic acid supplementation during pregnancy have been shown to be effective in preventing cleft lip and palate (CLP) in humans. ~Source
Exposure to benzodiazepines during pregnancy has been associated with a slightly increased risk of cleft palate in newborns. ~Source
Nicotinic Acid or Niacin is converted to NAM, which has benzodiazepine-like actions in the gamma-aminobutyric acid (GABA) system. ~Source
Therefore…Benzodiazapine’s cause a B vitamin complex deficiency.