Will I have to do double chin CoolSculpting again after pregnancy if I've done it once already?

coolsculpting and liposuction are permanent, if you gain weight it shoould be elsewhere however some of the fat is still there so there is always potential for the area to get fat still as there are still fat cells there.
if you want a dramatic change necklift/facelift, Implants and fillers will give you that. noninvasive will improve the area and facetite, threads, morpheus, and fillers can be used.  start at home dermarolling to tighten you skin, see emeragecismetics.com where we do free skincare consults daily and recomment MTS roller with anteageMD ampules daily (see dermarolling package).
With significant neck sagging you would need a neck/face lift with muscle tightening (platysmaplasty). at the same time lasers (fraxel,  co2 or erbium) or microneedling RF (fractora, intensif) can be . performed to improve the crepe skin or wrinkles.  You need a formal consultation, as the neck can be treated with a combination approach:
1. micro needling and lasers for texture
2. botox, disport or xeomin to help platysmal bands
3. intensif or fractora RF microneedling for crepe skin and lifting
4. fillers like belotero, restylane silk, juvederm volbella to improve lines and folds
5. neck/face lifting if sagging is prominent or early starting +/- platysmaplasty (muscle tightening)
6. J plasma/Renuvion, thermiRF, inmode facetite for internal tightening
7. ultherapy and thermage for external tightening
8. regular Venus legacy, exilis ultra, or inmode forma treatments with facials to maintain tightness
9. PDO novathreads or silhouette instalift cone threads for lifting and long-term collagen production
see an expert for a full evaluation and treatment plan based on your individual situation and goals.
Best, Dr. Emer

CoolSculpting is a non-invasive procedure that uses a vacuum applicator to draw in skin and underlying subcutaneous fat to deliver controlled cooling. This penetrates below the skin causing permanent elimination of fat. The fat cells that were destroyed are permanently gone. New fat cells from possible gain weight will have to be removed using CoolSculpting.