The first egg to have the DNA of a chicken would hatch into a chicken, said professor John Brookfield of the University of Nottingham in 2006. Chimed in scientific philosophy professor David Papineau of Kingâs College London:
1 Ferber states by 3-4 months most six month old babies should be able to sleep through the night. He doesn't say how long sleeping through the night is (at least I couldn't find it) but my guess is that he's going by 5 hours.  Healthy Sleep Habits, Happy Child.
1 But newborns rarely sleep for more than 5 hours at a time. 2  Newborn babies wake up when they are hungry and sleep when they are full or tired. 3  Until the age of 6 months, the part of a baby's brain that controls when he goes to sleep and wakes up is not developed yet. 4  2 months to 6 months old: 14 to 16 hours. Until the age of 6 months, the part of a baby's brain that controls when he goes to sleep and wakes up is not developed yet. 2  2 months to 6 months old: 14 to 16 hours. 3  This time may include naps. 4  6 to 12 months: 13 to 15 hours.