 [ Symptoms ] can 2nd hand marajuana smoke impact a baby is behavior  usual behavior is active smiling babbling very few actual words from ~500 pm while at grandma is 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 1100 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 [ Disease ] 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 is behavior was a direct result of marijuana exposure may be difficult to prove unless cannabis shows up in the child is 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