most helpful answer yes second-hand marijuana could definitely affect a baby. as a matter of fact any second-hand smoke can cause adverse health problems but marijuana would most likely result in some immediate effects. now whether the change in the child's behavior was a direct result of marijuana exposure may be difficult to prove unless cannabis shows up in the child's drug screen. dad should never smoke anything around a baby and should not be smoking in the house. third-hand smoke (smoke residuals that stick to the clothing carpets or body) have proven to be hazardous as well. he should not be smoking period but if he does he needs to do so outside -- away from the baby and others -- and he should consider changing his clothes and taking a shower afterwards. of course this would not likely happen. smoking cannabis around a baby is a very serious parental issue and should be dealt with before any future visitations face-to-face or legally.
can 2nd hand marajuana smoke impact a baby's behavior? . usual behavior is active smiling babbling very few actual words. from ~5:00 pm while at grandma's was totally sober totally silent no crying did not indicate hunger or thirst. managed to get one very small smile when oldest sister picked her up. around 11:00 the next day returned to normal with babbling smiling etc. dad is a marajuana smoker smokes in the house and cares for baby every weekday.