What can I do to make sure my 2 month old isn’t staying up longer than she needs to between naps? I find she sleeps fine in the mornings but afternoons she fights sleep more and more and then gets beyond tired in turn being super fussy.

Edit: i should clarify my question is HOW do I get her to nap to not exceed her 60-90 minute wake window. I don’t know how to tell my 2 month old it’s time to nap. In the mornings she eats then sleeps until the next feeding but in the afternoons she tends to start staying awake past feeding for longer and i don’t know who to get her down for a nap.