Squeaky toy

My son has started trying to communicate and he sounds like a squeaky toy. I have no idea where he learned this or what it is supposed to mean. I had just gotten used to the goo's and gah's now I have to try and learn what all the squeals, shrieks, squeaks, and screams mean. This is so much fun! I am surprised at how quickly he's learning and growing. He can support his head for longer periods of time, and he rolled over for the first time last week. I haven't witnessed this yet, but my husband has. I am excited for my son and all the things he's learning now. I will hold him sitting in my lap and talk to him and ask him questions. he responds with giant smiles and squeals that only dogs can hear! I just recently bought a jogging stroller and cannot wait to take him running with me. I wonder if he will sleep or squeal at all the new things he sees. I wish the wind would die down so we could go.....