growth spurt?

Cal • Married 6.13.15💘 Mama to 2 sweet girls 💕 3.23.17🎀 &3.20.20🎀 Baby 3 due April 2023
Hey all FTM here with a question... My 5 week old has been sleeping much more than usual and feeding for much longer (up to 70 mins) during her feeds.  Normaly she follows a very predictable pattern of eat, play, sleep, but the last two days have been so different.  Eat for a long time, sleep, repeat!   She hasn't been fussy, although last week she got a bit stuffy and I've had to use a nose frieda and saline solution to clear her a few times a day- no fever.  
Anyone experienced similar behavior with growth sport?