Hi my DD is turning 4 months next week, and has slept through the night since 7 weeks, last feed at 10pm, up at 8-9am She is extremely easy to settle, feed, play for an hour then nap for 1-2 hours. However from a few days ago, she has become more difficult to settle, demand a lot more attention and play time. She refuses to sleep during the day now and would scream as soon as she in in her cot. She started waking up at night, sometimes for cuddle, last night for a feed and is up around 6am rather than 9am. She is also putting everything in her mouth, drooling a lot and is becomes quite distracted during feed. Would it be teething? Ir just a new development stage? Should I just let DD play during the day as much as she wants instead of following the feed, play sleep pattern?