I agree to leave it a couple of weeks. I believe if you have an EASY that's working, with a happy baby that's sleeping well for naps etc then go with it, he may extend it himself in the next few weeks, or not. My DS stayed on 3 hr E until 6 months, there was no way he could go a moment longer so we never made it to a 4 hr EASY until we started solids. I used to have to track A times and E times separately so that A's were gradually extending with age but E's stayed at 3 hrs, but it worked out and a happy baby usually results in a happy mummy.