that's normal mommy, naffeel sila usually at 16wks pero depende pa rin lalo first baby. i started to feel mine at 18wks and hndi pa sya literal movement. pra lang syang butterflies or bubbles sa tyan then paminsan minsang pag umbok sa iba ibang part ng tummy ko. now 22wks, mas feel na at malikot. madalas momsh depende rin sa location ng placenta.