15 week old not napping

[user1499426734]

My 15 week old has started not napping in the day at all so she's wide awake and then struggles to sleep in the evening. She gets overtired and grouchy, any suggestions?

I found that mine couldn't be awake for more than 45 minutes at that age so always around that time mark I'd put him down for a nap, even if he wasn't showing the cues like running eyes or zoning out. Usually every time he would be asleep within 10 minutes so obviously needed it. Getting him to sleep was a little trickier.. I either had him in his car seat and would have to hold his hands at his sides to stop him from rubbing his eyes and waking himself back up or in the cot with a swaddle blanket.

*Rubbing eyes.