When will...
...she hold her head up?
...she only wake up once through the night?
...she sleep completely through the night?
...she be awake more than a half hour or when she's eating during the day?
...she only wake up once through the night?
...she sleep completely through the night?
...she be awake more than a half hour or when she's eating during the day?

Comments
http://www.babycenter.com/0_milestone-chart-1-to-6-months_1496585.bc
ill tell you about when my first two did these things... prep yourself:
hold up head- 5 wks/ 4 wks
wake once a night- 4 yrs/ 4 yrs
completely through the night- 4-5 yrs/ 4 yrs
wake more- 6-7 wks for both
the sleep issue was dreadful in my house. with my first she really just couldnt sleep all that long. by the time she started to finally sleep through the night my second was born and he woke her all the time. next thing i know they were waking several times a night, each. eventually hubby and i were so tired they would come into our bed without us realizing it (they were about 2 and 3 yrs old at this time). finally we moved and got a better schedule down. now they both sleep- at 5 and 6 yrs old!!!!!!! thank goodness because #3 is going to be here soon. my second- my son- has health issues, but my daughter had no technical excuse!
I wish you the best of luck with your 3rd and hope the sleeping schedule doesn't get messed up again! :-)