   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.
My one month old son still spends most of the day sleeping. He wakes up at 7am and we are usually awake until around 9 or 10 then he takes a nap and spends most of the rest of the day sleeping except for maybe 30 minutes when he wakes up to eat every 2-3 hours. Then at night he is awake for an hour or two before...