Re: 5 year old acting as a baby
I have to agree wholeheartedly with Maggieloop about the new babies at daycare. Many times when a new baby shows up, even when it's not at home, a lot of toddlers/pre-schoolers get that sense of not getting the same attention they got before.
Generally, if you try to focus on pointing out her "big girl" behaviors, and telling her you are proud of those things, she'll realize she can still get the attention she needs or wants, by acting her age.
Have the daycare providers noticed her acting babyish when she is there? I wouldn't be surprised if their answer was yes.
Maybe even giving her some simple "chores" at home and telling her that you are giving her these responsibilities because you know she is big enough to start doing more "important things", she will feel proud of earning your confidence in her, and start acting like a big girl again.
Best of luck and if you try some of these things, let us know how she responds. cmpgirl