With two children under three, you might assume that the Duke and Duchess of Cambridge have their hands full when it comes to parenthood.
But the notion of another prince or princess may yet be on the horizon, after Kate Middleton was overhead mooting the idea of a third child on a royal visit to Poland this week.
The Duchess, 35, was handed a cuddly toy bear as a present during a reception to celebrate start-up businesses in Warsaw yesterday.
Saying thank you for the gift - which is designed to soothe tiny babies - Kate turned to her husband, Prince William and joked: "We will just have to have more babies."
Designer Julia Sielicka-Jastrzebska, who made the bear, said: "We gave the Duchess some presents for Prince George and Princess Charlotte.
"She said they should have more babies, and they laughed."
Three-year-old Prince George and Princess Charlotte, two, accompanied their parents on the royal trip to Poland this week, in what many interpret as a diplomatic mission to smooth over relations amid the fallout of Brexit and the UK's decision to leave the EU.
Both Wills and Kate appear to have settled easily into their role as parents, but - as with anyone who has children - it hasn't always been plain sailing.
"There's wonderful highs and wonderful lows," William said of fatherhood last year. "It's been quite a change for me personally. I'm very lucky in the support I have from Catherine, she's an amazing mother and a fantastic wife.
"But I've struggled at times," he added. "The alteration from being a single, independent man to going into marriage and then having children is life-changing.
"I adore my children very much, and I've learned a lot about myself and about family just from having my own children. It's amazing how much you pick up just in those moments."
Kate suffered from severe morning sickness - known as hyperemesis gravidarum - throughout both her pregnancies.
"Parenting is tough," the Duchess said, when visiting a support centre in north London for mums struggling with mental health problems earlier this year.
"And with the history and all the things and the experiences you've all witnessed, to do that on top of your own anxieties, and the lack of support you also received as mothers... I find it extraordinary how you've managed actually. So really well done."
On another occasion in March, the Duchess delivered a speech to the Royal College of Obstetricians and Gynaecologists, where she admitted motherhood can be challenging - even with the support she gets from a live-in nanny and her mother Carole on-hand.
"Personally, becoming a mother has been such a rewarding and wonderful experience," she said.
"However, at times it has also been a huge challenge - even for me who has support at home that most mothers do not. Nothing can really prepare you for you the sheer overwhelming experience of what it means to become a mother.
"It is full of complex emotions of joy, exhaustion, love, and worry, all mixed together. Your fundamental identity changes overnight. You go from thinking of yourself as primarily an individual, to suddenly being a mother, first and foremost."