6 month old hardly napping!

Rachel

Hey all, my little guy is taking very short cat naps. He was taking about 3-4 35 minute naps a day, which is short to begin with, and the last few days have been about 3 naps, and only for about 20-30 mins each (unless he sleeps in my arms/on the boob, those naps are SOMETIMES longer). Anyone else having/had this issue? How do you encourage longer naps?