Thank you for your question.
I see that you are concerned about your child's eye movements.
If your child has been doing child checkups in Singapore, the GP or polyclinic nurse would have noticed the problem and done the appropriate follow ups. Otherwise, you should speak to your GP/polyclinic doctor.
They should be the best person to advice you on the next step. The likely course of action would be a referral to a pediatric ophthalmologist in private setting or at KKH or SNEC or NUH.