   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.
At 2 months old with an every-3-hours eat/awake/sleep routine (which, by the way is exactly the routine that I teach my clients to follow), your baby should be awake for 1 to 1 1/2 hours from the time you wake her for a feeding. have a 2 month old and I'm never sure how much awake time she needs. We're on a 3 hour eat, wake, sleep schedule. During the eating and wake portion she stays up around an hour-maybe a little more.