We have gotten my 4 month old son to sleep almost entirely through the night. He's generally a good sleeper. He takes a 2-3 hour nap in the morning, another 1-2 hour nap in the afternoon, and a
45 minute nap early evening. I used to put him down for his naps after 1hr 15 minutes, but he wants to stay awake longer now, so he is usually awake for 1hr 30 minutes to 1 hour 45 minutes. ...