I was having the same issue. My girl is just over 5 months and her first two naps are just starting to get to 1 hour but her last nap is generally 20-30 minutes. I try to keep the schedule consistent when it comes to nap times. If she's not screaming, leave her in the crib. If she's screaming wait 5 minutes or so. I found if I gave it a few minutes she would fall back asleep and sometimes surprise me with a nap of 1.5 hours.
I just tried the huckleberry app today and wow it worked like magic my baby started sleeping 1 hrs-1.45 hrs hoping this is the solution to our sleepless day and night. At least im praying it will be 🙏🏻
No advice, just following cause same 🥲