I am not sure from your note who exactly is getting the nebulizers, but
salbutamol (albuterol in the US) is used for tiny babies in huge amounts.
Children tolerate salbutamol in much larger doses than adults. Nevertheless,
even if some gets into the air, the amount the baby will inhale will be very
limited. Most of what gets inhaled doesn't get absorbed anyway.

Jack Newman MD, FRCPC