Eh, my girl sendawa sampai around 6-7 months, but honestly every baby different lah, some earlier, some later, and some memang jarang sendawa pun okay je. A few of us mums found that if you burp them properly after feeding (gentle pat-pat on the back or rub), they less likely to have gas issues later, so whether they sendawa or not, the technique matters more. If your baby on full FM, just make sure you burp them halfway through and after finish, and if they seem uncomfortable or bloated, that's when you worry, otherwise don't stress too much about it!