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.
Your baby needs lots of sleep, but she won't stay asleep for more than three hours or four hours at a time in her first few months. She needs to wake frequently so that she can refill her tummy, so be prepared for some interrupted nights.But be reassured that once your baby is about three months old, you can start to follow a set pattern every night. By six months she may even sleep through the night, allowing you to get more sleep again.Your baby will quickly come to appreciate the consistency and predictability of a routine.ut be reassured that once your baby is about three months old, you can start to follow a set pattern every night. By six months she may even sleep through the night, allowing you to get more sleep again. Your baby will quickly come to appreciate the consistency and predictability of a routine.