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.
Just like newborns, fetuses spend most of their time sleeping. At 32 weeks, your baby sleeps 90 to 95 percent of the day. Some of these hours are spent in deep sleep, some in REM sleep, and some in an indeterminate state â a result of his immature brain. During REM sleep, his eyes move back and forth just like an adult's eyes. Some scientists even believe that fetuses dream while they're sleeping! Just like babies after birth, they probably dream about what they know â the sensations they feel in the womb. Keep Reading Below Closer to birth, your baby sleeps 85 to 90 percent of the time, the same as a newborn.