Probably the amount of inhaled corticosteroid which passes milk is negligible and does not affect the infant.
The vast majority of experts believe that both this and the rest of inhaled corticosteroids may be used during lactation without risk to the baby.
Warning of the manufacturer:
No specific studies have been conducted to measure the excretion of beclomethasone dipropionate in the milk of lactating animals.
It is reasonable to assume that beclomethasone dipropionate is excreted in breast milk, but at the doses used for direct administration by inhalation, the probability that eliminate significant levels in breast milk is low.
The use of beclomethasone dipropionate in nursing mothers requires that the benefits of the drug be weighed against the possible risks to mother and child.