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.
IN THIS ARTICLE. 1  Typical sleep patterns for newborns. 2  Why newborn sleep patterns are unpredictable. 3  When your baby will start to sleep longer. 4  How to establish good baby sleep habits. Here are some tips to help your baby settle down to sleep: Give your baby a chance to nap frequently. For the first six to eight weeks, most babies aren't able to stay up much longer than two hours at a time. If you wait longer than that to put your baby down, he may be overtired and have trouble falling asleep.