Hey Brooke.
Zara's sleep varies heaps. Over the last 2 months, her nights have been as short as 9 hours, and as long as 11 hours. Her days have as little as 1/2 hr, up to 4 hrs. Depending on where she is (ie it is much worse at daycare) and how her night was. We are having success with the early waking, and for the last almost 2 weeks now, she has been getting a good 11 hours at night, occasionally longer (often with a slight early wakeup, sometimes requiring my attendance, sometimes not). Right now, we are struggling a little with 2-1 nap transition - she seems to be going OK, but I am a bit nervous about it. Last night was bad, and we have an early waking this morning - I actually think teeth, she was very very upset, but it will just mean we need two naps today.
If you choose a consistant approach to sleep, he will start to sleep more, especially if you can sort out the early wakings. WI/PD/WO has definitely helped us with that.
Also, his sleep will likely improve when he is feeling a bit better. Keep in mind since he appetite is way off, when it comes back, he may need much more than normal, kind of like a growth spurt. We also had NW that required feeding after a similar illness here.