are 2x 40 minute nap cycles enough rest for 3.5 month old???

[mariarico]

My LO is 3.5 months.

Her A time is 1h 40min and she self soothes herself to sleep (it might take 20 min or so). No crying.

She wakes up at 40min and self soothes (no crying) for about 15 then back to sleep for another 30-40 min (wakes up crank, crying).

so this is about 1h - 1h 10 min of sleep. But she wakes up crying after the second wake up. I try to soothe her but it takes another 30 min or so to go back. 

do i keep her up (even though she's cranky) or do i continue to let her sleep (even though it takes another 30-45 min)

[Papaya]

I would get her up after the second 40 mins

I wonder if she's a little UT - you could try increasing her A time by another 5/10 mins to see if it helps her sleep a little longer.