   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.
1 A good bedtime routine will probably last about 10 to 15 minutes, or a little longer if you include a bath.  Do use a security object as a part of your bedtime routine. A security object, like a stuffed animal or blanket, can be an important part of a good bedtime routine, especially for toddlers and preschoolers.