Your newborn still adapting to his own sleeping pattern. Sometimes they become sleepyhead, sometimes they love to be cuddle to sleep, sometimes they gets uncomfortable to environment around them ( can be too noisy, too quiet). Why not try to massage baby a little, swaddle n sleep side ways to make bby comfy. You can also on lullaby, or pat bby to sleep fully before bedtime. Also try to either BF or FM to make bby full before bedtime. Also FYI bby do make grunting noises to sleep because they trynna learn to breathe, their passageway is still small hence the noises.