It will probably go away.
Milo does it on and off with different people.

I also remember this lady I used to work with coming into to work one day all upset because her daughter was doing it to her (I think she was 2 or 3 yearsold). She'd wake up and night, and when this lady went into her room to comfort her she got "no I don't want you I want daddy!" and it went on for a week or 2 I think.