Aiyooo, ini normal lah at 5 months, babies start to get more efficient at nursing, so they isap faster and shorter, bukan means they're not getting enough! A few of us went through this and our babes' weight still climbed steadily, just slower than newborn phase. Tapi since you're noticing the weight gain is slow and feeds dah really kurang significantly, better check dengan doctor or lactation consultant to make sure milk supply is okay and baby's actually getting enough, bukan benda nak worry sangat, just peace of mind je, especially kalau balik kerja soon or ada concerns lain.