Thanks for your question. We would have you wait until you have finished nursing.We have discontinued Kybella treatments in our practice for melting submental fat. If you want a non-surgical approach, the FDA recently approved the SculpSure laser for treating submental fat (double chins). It is a quick 25 minute, completely non-invasive treatment. In the FDA study, the participants had 100% satisfaction after 1 or 2 treatments. In the Kybella FDA studies, there is high satisfaction after an average of 6 treatments. I did SculpSure recently and it was only mildly uncomfortable. I had no noticeable swelling. With Kybella, you will have noticeable swelling for 1-4 weeks. The treatment cost for 1 SculpSure Submental is less than the average cost of 1 Kybella treatment. Before you consider CoolScupt, try holding an ice pack under your chin for 4 minutes. Now think about doing it for an hour. You have youth on your side. I'm not sure that you will need any skin tightenng treatments after SculpSure Submental. Before considering Ultherapy, read the reviews about the high level of pain. Most patients don't return for their second treatment. Best of luck.