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.
This routine will teach your baby to soothe herself to sleep, and you won't need to rock or cuddle her to sleep every time she wakes up during the night. Safety First: Lower SIDS Risk Every time you put your baby down to sleep, whether it's at night or for a nap during the day, the American Academy of Pediatrics recommends that you do the following to lower the chances of SIDS (sudden infant death syndrome): Always put your baby down to sleep on his or her back. Always use a firm sleep surface.