Co sleeping can ease a parents worries about their child while sleeping. However co sleeping is very dangerous and can lead to suffocation especially with surrounding pillows and blankets. This is particularly true for infants that cannot yet roll over. Once infants can roll over co sleeping can still be dangerous but there is less of a risk of suffocation due to their ability to roll over. I would not advise co sleeping if one or more of the parents are heavy sleepers or move excessively in their sleep.