Sweet moment of the Duchess of Cambridge on a balcony during Trooping the Color

Compared to the highlights of last year – and the misdeeds of Prince George and Savannah Phillips – the royal kids were rather wise at this year's Trooping the Color event.

Maybe last year's antics partly explained why the Cambridge kids were standing on the other side of the balcony in front of their cousins?

That said, there were some cute moments, mainly because of Prince Louis who stole the scene and who was VERY excited when flying over the RAF.

Thanks to this enthusiastic and adorable toddler, we also had a "moment of celebration" between him and the Duchess of Cambridge, to which many parents could identify.

The one-year-old prince was seen sucking his thumb while he was on the balcony of Buckingham Palace.

Noticing that his youngest was in the habit of taking this habit, Kate gently removed her thumb from her mouth – and the young man did not look any happier.

It was not the first time Louis was spied on, thumb in his mouth.

Earlier in the day, the young man was seen staring through one of the windows of the palace, sucking his thumb again.

Neither George nor Charlotte have ever been seen doing the same thing, but it is a fairly common habit for babies and young children to develop.

Most children are thought to have already started smoking at age four or five, although some will continue to smoke at night.