4 months most los are taking 2-3 naps I suppose that's because they are long naps
Most of what we see on the sleep boards are 4 month olds going through the 4 month sleep regression and taking several 40 min naps (or 20min, 30min, 45min depending on the individual). My own DS was doing 4 or 5 naps at this age, pretty much every nap 40 mins with the occasional long nap thrown in randomly and I never knew when it was going to happen.
the samples are good for a guidance but it's worth noting that if someone was struggling through a period of short naps they would be unlikely to post their routine on a sample EASY thread.
I agree it is very frustrating. Also very tiring.
You will get through this x