asÂ·soÂ·ciÂ·aÂ·tive property. The property of addition and multiplication which states that a difference in the grouping of numbers being added or multiplied will not change the result, as long as the order of the numbers stays the same. For example, 3 + (4 + 5) is equal to (3 + 4) + 5. See also commutative property, distributive property. 1  Facebook.
The most common recommendation is to initially place infants to sleep on their backs for the first 12 months. However, when the infant is able to roll over on their own in to the sleep position of his/her choice than it is fine to leave the baby in that position. My children are now 29, 27, 24, and 11.
Prevention. There's no guaranteed way to prevent SIDS, but you can help your baby sleep more safely by following these tips: Back to sleep. Place your baby to sleep resting on his or her back, rather than on the stomach or side.This isn't necessary when your baby's awake or able to roll over both ways without help.revention. There's no guaranteed way to prevent SIDS, but you can help your baby sleep more safely by following these tips: Back to sleep. Place your baby to sleep resting on his or her back, rather than on the stomach or side.