6-month old very fussy and will not calm down to take a nap

[Anonymous]

My 6-month old became very fussy and hard to calm down almost immediately after turning 6 months. He complains about something old day long on and off, and its almost impossible to get him to take a nap. His nap schedule is very strange, not the same every day, and I thought at about this age it should become more predictable.
I am wondering is this teehing? How to be sure if that is what is causing a discomfort? For naps also, what is the activity time at this age? 2 hours? or more? It used to be 2 hours, but now it became very hard to tell when he is tired and I am worried that I am missing the window when i should put him down, and he becomes overtired.
For unconsolable fussiniess, is there anything else at this age that might be causing the fussiness?

[Anonymous]

Nothing helpful, just wanted to commiserate. I feel like my 6 month old has this chronic, low-grade fuss/whine that lasts all day. Can't figure it out for the life of me -- he's at his best in the early afternoons right now. Sometimes I give him Tylenol but it doesn't really appear to be helping. His napping is also off -- sometimes he'll go down for a nap within 1.5 hours of waking from another one, which seems really unusual to me.

[Anonymous]

it's probably teething. Give him some tylenol and see if it helps.

[Anonymous]

Sounds like classic overtiredness.