Its true:
https://praxistipps.focus.de/malzbier-in-der-schwangerschaft-und-stillzeit-alle-infos_119812
You will be pleased to know:
100 milliliters of malt drink have an average of around 40 calories. Since you have a higher daily calorie requirement during pregnancy and while breastfeeding, you can enjoy a malt beer every now and then with a clear conscience.