Several fans pointed out similarities in his appearance, debating whether he resembles his mother or father more. Others compared him to his older brother George, noting how fast all three children seem to be growing.

The conversation also turned to George, with some mentioning that he’ll become a teenager in July and already appears quite tall. During a recent Easter outing, fans even joked that he might eventually match or surpass his father’s height. Reportedly, William stands at around 6’3″, while Catherine is about 5’9″, and George doesn’t seem far behind.

Overall, the birthday post gave royal watchers another rare and much-loved glimpse into the children’s lives, while also reminding many just how quickly time is passing.