Needing advise or anything any mommy's can give me

Billie • Wife to Jonathan! Mommy to Fallon Grace!

I am a first time mommy. My girl girl is almost 4 months old. She will randomly start crying and my husband and I do everything to get her to stop crying and she will cry for hours. We hold her walk around with her, we try to rock her, I have put her in the wrap so she can be against me. What else can I do?