One side or two?

Megan • Trying for our third! First baby a miscarriage, chemical then rainbow. Second baby 9 months of trying 4 with clomid. Hoping for a quick easy pregnancy for #3
My little one is 2.5 weeks and at first he would nurse from both sides 10-15 minutes now he is only nursing from one side around 15 minutes and falling asleep is this normal to only nurse from one side?