Naptime help!

My little boy is 9 weeks old and is an amazing sleeper at night. Wakes up once for a feed and straight back to sleep! But during the day he's starting struggling to nap! He will only nap while I'm pushing him in the pram and even then sometimes he struggles to fall asleep and then gets overtired and very cranky. I've tried baby wearing - he hates that! Tried his rocker and swing with no luck and tried rocking him in my arms etc etc but nope. Has anyone got any tips that I could try? TIA! Pic for cuteness 🥰