Kim Kardashian shared with fans a cute photo of Saint West riding a tricycle.
The snapshot shows Saint dressed in a Harley Davidson baseball tee and sweatpants as he plays on a Big Wheel.
The pair appeared to be at a farm or petting zoo, as bales of hay can be seen in the background.
Kardashian and West, who married in May 2014, are also parents to 4-year-old daughter North West.
"Obviously North loves Saint, she just is still jealous," the mom-of-two explained.
"She needs to still get it together and warm up and be a little bit nicer, but I think she's getting there," she said.
Kardashian confirmed in September that she and West are expecting another child via surrogate.
People previously reported the couple "found the perfect candidate" and "want everything to be perfect" with their third child.