How Prince Louis' First Official Photos Compare to Princess Charlotte's

Last night, Prince William and Kate Middleton finally shared some official portraits of their third child, Prince Louis, who was born on April 23.

Following his first photo op, which the baby royal basically slept through, his mother took some adorable portraits at home, one of which features Prince Charlotte kissing her baby brother on the forehead.

But how does Prince Louis' first official photo with his sibling compare to Princess Charlotte's first portrait with Prince George?

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1. Prince Louis' new photo was taken on a specific date.

Unlike the photo of his siblings, Prince George with Princess Charlotte, Prince Louis' new portraits are both dated. Conversely, Princess Charlotte's baby portrait, shot with her big brother, was taken sometime in mid-May 2015.

Related article: In Photos: Princess Charlotte's Cutest Moments To Date

In this respect, Prince Louis' new portrait is special, as it was taken on Princess Charlotte's third birthday, and is an important memento of the day. This is especially important as Prince William and Kate Middleton didn't share an official portrait for Princess Charlotte's birthday this year on the actual day—but they have now.

2. Prince Louis is fast asleep in the photo with his sister.

Much like at his first photocall, Prince Louis appears to be fast asleep in the photo taken with Princess Charlotte.

However, in her first portrait, Princess Charlotte looks directly at the camera, and is very much wide awake. And in this outtake, the princess looks very alert:

3. The mirrored poses in both photos serve as a welcome to the royal family.

Welcoming their new siblings into the fold, Prince George kisses his younger sister, while Princess Charlotte passes the torch to Prince Louis with a kiss on the forehead. With their matching poses, both photos pay tribute to the expanding family of Prince William and the Duchess of Cambridge.

4. Both photos were taken by Kate Middleton.

With her sharp eye, the Duchess of Cambridge has captured her young children in the sweetest poses. It's incredibly apt that she's responsible for these official portraits of her children, as she's giving us an intimate glimpse into the lives of her family, and the baby royals, at home.

Related article: Everything You Need To Know About Prince William And Kate Middleton's Children

This article originally appeared on Harper's BAZAAR US.