Convertible car seat

We ordered Sophia a new car seat. This one is a convertible car seat, so long to the infant car seat that once carried my baby. We are on to a big girl seat. I can't believe how overwhelmed with emotion I feel right now. I remember being pregnant and obsessing over the car seat finally settling on a Chicco green Travel system. I thought about how easy it would be to take her out of the car and click her right into the stroller. It was great while it lasted. Now Sophia is eager to see what is going on. She loves watching everything going on around her. Because of this reason and cause she exceeds the weight limit on her current seat, we had to purchase a big girl seat. I am so excited about all the new things coming along but I can't help but feel a little sad. She is getting big so fast. She is growing before my eyes. I see baby pictures and don't remember her being that small. Her newborn clothes don't seem like they ever fit her (when was she that little). I'm sure these emotions are ongoing throughout motherhood but how do you deal. Now I know how my mom felt all my life. She would say "one day you will know".... Well that day is here. I love you baby Sophia, you make mommy so proud.