DD was gettnig to point she was sleeping some nights through the night but mostly she'd wake up once but for the last almost 2 weeks she's been waking up a lot during the night. Sometimes 4 times to nurse. She hasn't woken up more than once during the night to nurse since she was like 2 months and now she'll be 6 months on the 4th. The past 2 nights she's only woken up twice to nurse. How long do growth spurts last? I do assume this is because of a growth spurt.