Eh susu formula yg tinggi kalori dan lemak macam S-26 Gold, Enfamil A+, or Lactogen biasanya bagus untuk naik berat badan, tapi honestly yang terbaik is tanya pediatrician dulu sebab tergantung kat reason kenapa baby tak gain weight, bisa dari formula choice, feeding schedule, or ada something else. A few of my mum friends, their babies gain better weight once doctor adjust formula or feeding pattern, so jangan main-main with this one lah, best check with clinic first! They'll recommend yg paling sesuai for your baby's needs