Wa'alaikumsalam wa rahmatullahi wa barakatuh! Honestly baby's head circumference boleh vary quite a bit, especially dalam bulan-bulan pertama, a few of us went through the same worry masa first baby. Best la bawa baby gi check dengan paediatrician atau midwife because they'll measure it properly against growth charts and dapat tengok if it's following a normal pattern for baby's age. Don't worry too much lagi, most of the time it's just normal variation je, tapi doctor boleh give you peace of mind and monitor along the way. Sharing sikit dari experience, friend aku pun stressed gila time first check-up, tapi doctor kata everything was on track lang. Mana tahu baby ko pun sama je!