I am not into putting children into dead set schedules. However, I recently read that at four month infants usually need to sleep every hour to 2 hrs. Being able to write down when he last woke up made it easier for me to know when he was sleepy again. Now, I dont have a baby crying for no reason. I know when he has been fed, last woken up**** the most important and from which breast he was fed last.
josephinezazueta about Eat Sleep: Simple Baby Tracking, v2.6