   A heavier plane has more momentum (when thrown at the same speed),  but it's also got more downward force acting on it. If it has the  same wing area, though, it has the same lift, so it drops more  quickly than a light plane (objects fall at the same speed only in  the absence of air resistance).
By 2 months, baby's bedtime should be between 6:00-8:00pm and should occur about 1 hour after the last nap ends. 3 months: babies this age should be on a solid 4 nap schedule with the last nap of the day ending by 5:00pm.
Age Hours Of Sleep 0 - 2 months 10.5 - 18 2 - 12 months 14 - 15 1 - 3 years 12 - 14 3 - 5 years 11 - 13 5 - 12 years 10 - 11. The #1 tip for good sleeping habits in children is to follow a nightly routine. A bedtime ritual makes it easier for your child to relax, fall asleep and sleep through the night. Studies show that 37% of children, kindergarten through fourth grade, suffer from at least one sleep-related problem.