Marisa (11 weeks tomorrow) is on 4 hour easy too and pretty much always has been although it used to sometimes be 3.5.
Basically she wakes up between 7:15-8 in the morning and we go from there. She is awake for about 1.5 hours include feed time so that means two long naps (2-2.5 hours, although sometimes I too fight the 45 min naps) and one catnap. We still struggle with the catnap but that is OK and normal I understand.
However, in the evening, she only goes about 3 hours. After the 4pm or therabouts bottle, I try to get her to catnap for at least an hour. Often I can only get 30 minutes in, meaning she's really tired and hungry earlier than normal. So that means her dinner bottle is usually only 3 hours after the prior one. She always finishes it though, unless her reflux is really bothering her.
We also don't dream feed - it didn't work for us. So after her dinner bottle around 7 and bed around 7:45/8, we let her go until she wakes us - generally between 3-4 am these days.
HTH.
Karen (Marisa's Mom)