According to royal expert Katie Nicholl, Meghan "has been taking it easy" - and only recently started exercising again.
"I hear that yoga is very much on her post-birth fitness regime, nothing too strenuous" Ms Nicholl tells Entertainment Tonight.
"That's all Meghan has been doing. And lots of proud walks around Windsor Great park, so gentle exercise, but no hard training, no weights."
Ms Nicholl continued: "She's apparently not in any hurry to ping back into shape. She's enjoying this time. She's being gentle to herself.
"As I say, the whole approach has been holistic; it's been very gentle.
"It's been a natural embracing of motherhood, and with that comes a pretty gentle routine. Meghan hasn't been hitting the gym. She hasn't been in any hurry to get back in shape. It's only four weeks really since the birth and she's been taking that exercise regime very gently indeed."
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