My sweet little guy is 5 months old today. I've figured out why he's been getting mad on the playmat where just a few days ago he was happy for a long time--he can't get the hanging toy into his mouth! This frustration causes him to scream. I found him on his back today after I had put him on his tummy to play. He's still a happy guy that goes to sleep super easy and just wakes his Daddy up once around 5:00 to eat...and then he goes back to sleep. Living life with 4 kiddos in tow feels normal and, for the most part, manageable now.