Wa'alaikum assalam sis! At 1 month, baby mmg still adjusting, jadi yang penting is frequent feeding, either breastfeed on demand (8-12 times a day) or formula every 2-3 hours, depending on what you're doing. A few of my mum friends noticed their babies gained better weight once mereka check latch (if breastfeeding) or make sure formula mixing is correct, so maybe worth getting lactation support or asking your clinic nurse to watch the feeding process. But honestly, weight gain at this age boleh vary quite a bit, so I'd suggest chat with your pediatrician, they'll tell you if baby's on track or if ada anything to adjust. How's your baby feeding at the moment, breastfed, formula, or combination?