What exactly does a growth spurt entail?

[HomeIsWhereTheGinIs]

My DS will be three weeks next week and I've been told to expects growth spurt but would love to know what that'll mean from a routine point of view. Presumably he'll just put on more weight suddenly - but will he feed more? Sleep more? What did your babies do? Thanks!

[IWillOnlyEatBeans]

They will definitely want more milk! Which might mean they wake more often during the night. Are you feeding on demand?

[soupmaker]

Yes, lots more demanding milk. Waking and demanding milk more often at night as well as during the day. Cluster feeding, which can entail being pinned to the sofa for hours.