Your English is great, don't worry!
Looking at your daytime routine, you probably want to stretch your A times a little bit -- I'd increase them by about 10-15 minutes every 3-4 days (if you can -- do it slower if he starts getting overtired) until he starts taking longer naps (somewhere closer to 2 hours). That will help you to drop that nap later in the day. At 7 months, he should be on 2 naps, but it's hard if his A times are shorter earlier in the day. If he has longer A times and takes longer naps, he should be able to make it to bedtime on only 2 naps.
The other thing is that he might genuinely be hungry in the middle of the night. If you feed him straight off, will he just go right back to sleep? My ds was feeding multiple times in the night at 7 months -- it turned out that it was much easier to just feed him and get back to sleep within 20 minutes or so instead of trying to just keep on resettling. I'd work on the routine, and then if the night wakings persist, I would probably just feed him and reevaluate in a few months to see.
What do you think?