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.
At night-time: All this should help your baby to start to understand that night-time is for sleeping (Sleep 2003) . Give him a chance to fall asleep on his own. When your baby's between six weeks and eight weeks old, you can teach him how to fall asleep on his own.Put him down when he's sleepy, but still awake.ll this should help your baby to start to understand that night-time is for sleeping (Sleep 2003) . Give him a chance to fall asleep on his own. When your baby's between six weeks and eight weeks old, you can teach him how to fall asleep on his own. Put him down when he's sleepy, but still awake.