My baby is 11 weeks and 3 days so sort of in the same boat
we have fallen in to a bit of a routine, but it can change some days! Although it has been good to have a rough idea of how the day might go. This may be really long winded but typical day:
8am - awake, change nappy, feed, bit of a play and then back down to sleep (I just keep her in her sleepsuit, I'll sometimes go back to sleep myself or have a coffee in bed!)
9.30am - awake, change nappy, get dressed for day, bring her to kitchen with me while I do dishwasher/laundry etc.
11am - feed, usually try and get out for a walk around this time and she will start dozing off
12pm - back down to sleep for around 2 hours
2pm - awake, change nappy, feed, bit of play time in bouncer/playmat
3pm - usually falls asleep for a shorter nap here
4.30pm - bring her out to kitchen with me while I make dinner (put toys in front of her/talk to her as I'm cooking to keep her entertained!)
5pm - change nappy, feed before we get our dinner, put her in her chair out in the kitchen beside us while we eat
6pm - usually sleeps a couple of hours
8pm - awake, change, feed, play (she is always up for some fun at this time! So we will just talk and play with her)
9pm - bath, sometimes will doze off afterwards for a short sleep
11pm - last feed of the night, put her in her next to me crib and she is usually asleep by about 11.30pm and will sleep through to morning.
She does go up to bed which suits us the moment, but I would imagine bath and bedtime will start creeping earlier and earlier gradually! I dont think it is anything we have necessarily done that has set the routine, she kind of just adapted to it herself so fingers crossed your DS has just had a rough couple of days and will settle himself in to a nice routine 