I have a spirited five month old who is also not a big eater (especially during the day) and a 2 1/2 year old in preschool two days a week. It makes it very hard to maintain EASY with your little one!
I had to modify the 4 hour EASY to accomodate my older daughter's school days. My baby still takes three naps a day, but I have had to move them around so she doesn't get her routine messed up on the days we have to go to and from school.
Here's our day:
E 7 AM wake & eat
A (on school days we take my oldest to school at 8:45)
S 9:00 to 10:30
E 11 AM
A
S 12:30 - 1:30 (I have to wake her so we can go pick up her sister)
A
E 2:40 or 3:00 ish
A I try and interact/play with her at least for a few minutes, so she doesn't go to sleep with this bottle
S 3:30 - 5:30
E 6:00 (solids)
A
E 7 PM
A Bedtime routine
S 8 PM
Dream feed 11 PM (she often won't take much because she's sleepy)
Wakes at 4:00 and 6:30.... but we shh/pat to get back to sleep. I used to think she was hungry when she woke at 4 AM, but she just drank a little & dozed back off.
Moving to this routine, my daughter has started drinking more at feeds during the day and when I feed her at 7 AM she doesn't guzzle the bottle as if she is starving from going all night without one.
It's kind of an awkward routine, but I think my daughter seems a lot more comfortable with a routine.
Also, she cries before every nap and every night before bed. I have read that some babies need to do this to expend extra energy..... I don't know if it's true, but it reassures me to think she isn't miserable.
I actually lie on the floor by her crib when she wakes at 4 AM and 6:30 AM, so I can shh/pat her whenever she needs to be reassured. The PU/PD didn't work for us because it got my daughter more wound up and her pre-sleep crying went on a lot longer. It's very slow going, but my daughter is getting easier and easier to soothe back to sleep during these night wakings.
My husband is also a little less than helpful in my attempts to implement a routine. In the middle of the night, he'd much rather give our daughter a bottle so she'll be quiet & fall back asleep quickly.... which, of course, is encouraging her to use the bottle as a prop instead of learning how to go to sleep on her own. As a result, I'm doing most of this myself (which makes me a little miffed/tired, but I know it will, ultimately, get better as my daughter learns to sleep through the night).
HTH and you find a way to work out a routine for both of your children - it's really tough!