A team of scientists from the Monell Chemical Center found out that the nicotine contained in breast milk of lactating mothers suffering from tobacco, reduces the sleep time of the child and makes him/her restless. According to Dr. Julie A. Menella (Julie A. Menella), the baby wakes up faster, when there is less time between the smoked cigarette and feeding procedure. This investigation, published in the journal Pediatrics, again raises the question of the impact of smoking on the child during feeding. In most cases, if a woman quits smoking during pregnancy, then after birth the young mother often returns to the harmful habit. During the investigation, researchers conducted observations of 15 nursing infants in two days. Every mother should have to smoke 1-3 cigarettes before the observation period (which was 3.5 hours) in one day, and stop smoking the next day. After feeding children were placed in the back pending theirl asleep. Actigraph was attached to each baby, which allowed registering their status during sleep and its duration. Also, levels of nicotine and cotinine in breast milk were measured. The results showed that if the mother smokes a cigarette before feeding, sleep time of a child is reduced by 37%. The level of sleep anxiety is directly dependent on the amount of nicotine contained in breast milk. According to the conclusions of scientists from the laboratory Monell, the highest level of nicotine in the milk of the mother is observed in 30-60 minutes after smoking one or two cigarettes. Complete cleansing occurs within three hours. Thus, nursing mothers, who can not stop smoking, should control the time of feeding regulating the amount of nicotine that a baby receives with breast milk.