Waist training

Hi I was wondering if I could get some advice? As you know waist training is popular whether it's after having a baby or just to add on to an exercise routine. A lot of Drs discredit using these waist trainers, however a lot of women swear by them. I'm wondering if anyone has, or plans to use one after pregnancy? If so what did/will you use? And how soon after pregnancy to start using it? Thank you for your feedback!