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.
Give your baby the chance to fall asleep on her own. You can start this as early as six weeks as your babyâs natural circadian rhythms, or the âsleep-wake cycleâ, which helps regulate her sleep, start to develop (NSF nd). Put her down on her back when she's sleepy, but still awake.