Prince William, Kate Middleton and Prince Louis
Prince William reveals that his and Kate Middleton’s youngest son, Prince Louis, is now teething. Pictured: Prince William and Middleton pose for photographers with their newborn baby boy Prince Louis of Cambridge outside the Lindo Wing of St Mary's Hospital on April 23, 2018 in London. Getty Images/Jack Taylor

Kate Middleton and Prince William’s youngest child, Prince Louis, has another milestone.

On Wednesday, the Duke of Cambridge stepped out to visit London’s Air Ambulance Charity. Since it was the Duchess of Cambridge’s birthday, he received several cards and presents for his wife.

Prince William was presented with a squeezy helicopter toy. “Amazing, that will go down extremely well,” he exclaimed. Then the duke implied that his little boy’s teething when he said, “Louis will be chewing that before long!”

Prince William also opened a brightly-colored handmade card for Middleton. He said that their daughter, Princess Charlotte, would love it.

Prince William also joked that he was impressed that they remembered his wife’s special day. He quipped that he also remembered the occasion that morning, so it was just fine.

One staff asked the duke if he prepared something special for Middleton. The second-in-line to the throne gave a hilarious response when he coyly said, “That would be telling!” This made everyone burst into laughter.

In December, Prince Louis celebrated another milestone by turning eight months old. The little prince also received his own stocking that matched Prince George and Princess Charlotte’s at the time.

The trio’s sacks were printed with crowns and the words “Express Mail Service” along with their respective name and a delivery date that read “25th December.”

Middleton delivered Prince Louis in April. The Duchess of Cambridge had a speedy recovery. She only spent 12 hours in the hospital and stepped out seven hours after giving birth for Prince Louis’s public debut.

According to insiders, Middleton doesn’t stay long in the hospital because she knows that her presence will only cause frenzy outside the facility where photographers camp to get a first glimpse of the Duke and Duchess of Cambridge with their new baby.

Middleton looked pristine when she faced the public with her newborn, which impressed many but not all. Radio host Meshel Laurie slammed the duchess for giving new moms pressure to look good after giving birth.

According to Laurie, Middleton was sending an “unrealistic message.” She added that unlike most who found Middleton’s look inspiring, she personally found it “troubling.”