Fussy

Adrienne
My 16 week LO is acting out of character:
 
- Woke at 3am crying and needed to be rocked back to sleep (has been sleeping straight through the night since 6 weeks)
- Doesn't seem interested in anything we do to keep her entertained today (screams and fusses after about 10 mins)
- many short naps through the day (5 or so) usually she cat naps, but not so many 
Ideas: 
- teething? She drooling a lot and putting everything in her mouth 
- has a cold? She's very contested (using nose Freda and humidifier) 
- 4 mo sleep regression 
What do you think?