Nearly 4 month old gone fussy?

Le

Last 3 days she’s been super fussy in the day

Night time isn’t as bad

She doesn’t seem interested in the boob gets frustrated really quickly I’m going to track her nappies but there’s been enough for me not to question it

She then gets her hands in her mouth I think to comfort her as its the same hand/fingers ect

She’s not really sleeping in day then gets overtired worried she’s not getting enough milk

Didn’t know if she needs a dummy for comfort