My daughter in law just had a baby what is the best way for her to treat stretch marks?

Mederma. Medermastretch mark cream will lighten fresh red stretch marks. They will not disappear but will improve in appearance. Further treatment options are fractionated laser, co2 or erbium performed in a series of 3 sessions about one month apart. Another treatment option is carboxytherapy or injections of carbon dioxide gas which can be done weekly for a few weeks with on downtime.
Strivectin . Emollients for the skin with vitamins c and e can help repair stretched skin. Topical creams such as strivectin and cellulite creams may help an shoild be used daily with massage to stimulate circulation. Finally there are some laser treatments to repair the skin of there is no improvement with time and conservative treatments.