Once you feel ready and recovered enough to start some gentle stretches, these can be helpful in temporarily relieving any muscular aches and pains sustained from prolonged sitting and feeding, and are also a good way of checking in with your new postpartum body and getting used to movement once again. Don’t overdo it; think gentle and slow movement of the spine, shoulders and lower legs. It’s less about flexibility, more about mobility.
Examples of mobility exercises:
Standing spinal roll-downs
Standing thoracic twists
Cat-cows on all fours
For guidance, have a look at the following resources: