   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.
J. Guarnieri says: I have a 3 month old as well, and I try to make sure she gets at least 45 minutes of sleep after 2 full hours of being awake. Her schedule is roughly wake up, get a diaper change, eat, play for an hour, get held for a while, then sleep. After she wakes up, we start it all over again.