Babies don't reliably kick or react to outside noise, so this isn't a sign of a hearing problem. By 30 weeks hearing has usually developed, but sleep, position and how deep the baby sits in the womb all affect whether a kick is felt after a sound. What matters for wellbeing is your baby's overall movement pattern through the day, not the reaction to one noise.
Next Steps
Start tracking overall fetal movements instead, most babies have a usual daily pattern of kicks and rolls by this stage. Mention this at your next antenatal visit so your obstetrician can check growth and heartbeat on examination.
Health Tips
Contact your obstetrician the same day if you notice a clear drop in your baby's usual overall movements, not just a lack of response to sound.