   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.
The trick is in helping your child learn to go to sleep herself. How much sleep does your 1-year-old need? Typically, children this age sleep for about 11 1/2 hours at night and take two naps during the day for a total of about 14 hours out of every 24.By the time your child reaches his second birthday, he may be sleeping about an hour less, with only one nap making up part of his typical 13 hours or so of downtime.he trick is in helping your child learn to go to sleep herself. How much sleep does your 1-year-old need? Typically, children this age sleep for about 11 1/2 hours at night and take two naps during the day for a total of about 14 hours out of every 24.