Do growth spurs make baby sleepy?

My LO is 6 weeks and 3 days old. She spent most of last week fighting sleep during the day but the last two days she has been doing nothing but nursing for 10-15 minutes and then sleeping for an hour to hour and a half.

It seems like all she wants to do is sleep.

Is this a growth spurt?

She doesn’t show any signs of illness. Her temp is fine, she’s alert and happy when she’s awake, and she has good diaper output. The only difference is she spit up three times today but in her defense my boobs were also very full and I have a strong let down