The day before Liam's first day at preschool in March 2011.

And just like that, seemingly in the blink of an eye, two and a half wonderful years at Liam's preschool are over. I can't believe it.

I remember his first day there like it was yesterday - literally yesterday! I remember, the anxiety (mostly mine) and anticipation as we headed into the unknown. And I remember the surprising heartbreak at leaving him somewhere unfamiliar and how different and how much harder it was at first than the separation of leaving him with a babysitter in our house.

The day before the first day of school year, September 2012.

Over the years, Liam, who started as a quiet two year old, has blossomed into a confident, talkative, social and outgoing four and a half year old, in large part due to his time there. One of the things I have loved the most is seeing the friendships his preschool experience has fostered thrive and his friends' families have become our friends too.

Liam has learned not just about dinosaurs and birds and volcanoes and worms and the life cycle and the solar system and "jobs and careers" (yes, they really did a module on jobs and careers!) but he has developed curiosity and a love of knowledge, and he has learned how to be part of a community.

Liam during the last week of preschool, August 2013.

As his preschool class disperses (as is the nature of Brooklyn, everyone is going to different schools) I feel bereft... yet also excited about the next stage and the new community we are joining as he starts a new, bigger school next week and goes into pre-K. We went to orientation last week and met his new teachers and some of the other parents and I am excited about what the future will bring.

Plus Jack will start at his old preschool at the end of this week! So we will not be going completely into preschool withdrawal... but will miss all our departing preschool friends.

What transitions are you going through right now and how can photos of your kids help you reflect as well as, mark this time and look forward?

Leave your thoughts in the comments!