Oo normal yan, momsh! Ang bunbunan ng mga bata ay talagang malalim pa, lalo na kung 2 years old pa lang, it takes time to close completely, sometimes up to 3-4 years pa or even later. A few of us moms have babies na ganyan din, so don't worry, pero if it feels super sunken-in or kung notice mo na may fever or unusual behavior, definitely check with your pedia para lang sa peace of mind, okay?