4 month update

Here are a few new milestones and interesting things Emily learned this month:
- she rolled over from front to back for the first time!
- She learned how to hold something in her hand and is slowly learning how to put things in her mouth
- She holds her head up all on her own now with no support and can sit up with support.
- She can mock the sound of your voice and repeat it back to you

She also started teething this month, which should be an interesting adventure...