Meghan praised "amazing dad" Prince Harry and revealed an intimate pic of him admiring his infant son.
The family of three will kick-start the 10-day trip in Cape Town on September 23 with plans to conclude in Johannesburg on October 2.
"Can someone please show Meghan how to hold a baby?" one critic complained.
Critics like Piers Morgan are slamming the royals for reportedly planning a small, private christening for their son.