I am with Minny,
Have you started solids yet??

Dinner if you have started solids
Bath 6[m
Bottle or breast 6:30pm
books and bed after bottle.

Or skip the dinner and go straight to bath, bottle, stories an bed.
My DD is 4mths and has a power nap at 5pm to 5:30pm, bath at 6pm breast at 6:30pm then into her sleeping bag and bed with a kiss and goodnight.
See how you go....he may have hit a milestone that is making him unsettled