My baby is growing up....formula, teeth, oh my!

Well we are 8 days shy of Masons 9 Month birthday and today we tried giving him formula for the 1st time. He drank 4 of the 6 oz. We did 4oz of formula and 2oz of bm. It is crazy to think that he will start drinking formula and real milk over the next few months. I feel pretty proud to say as a working mom, I lasted almost 9 months, exclusively breastfeeding. Mikael and I have a trip to Mexico April 7th so I figured we should start introducing formula now, in case we don't have enough BM for when we are gone. A few other updates on mason as an 8.5 month old....
- He currently has 4 teeth that are thru the gum. His top middle tooth came in 1st (1/31) and then 2 other teeth on the top. He finally had a bottom middle tooth come thru on 3/5. He is just the cutest little guy with his pearly whites.
- He loves crawling and can even go up the 1 step in our tv room without any issues! He crawls on all 4s and is very fast!
- he is pulling up on everything and can walk side to side of holding on to a table.
- he is getting good at waving "hi" or "bye" which he began doing around 8 months
- he eats baby food (2nd foods) and some people food (bananas, Cheerios, sweet potatoes) and love yogurt bites and puffs!
- finally, when he sees Mikael and I enter a room he will crawl to us and want to be picked up. Also if he is in his bouncer and sees us enter the room he will raise up both arms to get picked up.... It is very cute!!