My son is 2 yr 10 months old & he is not properly talking. He speaks only single words. Can you suggest me what should I do?

hi sis my son start talking at age of 7months like dadada and papapa at 9months he talked better like hearty cat dog bird and now at age of 1yr and 6months he can talk 3-4 words straight even love you mama. my secret instrumental music since baby and eye contact po ginagawa ko momshies..until now instrumental music po sya, no tv and no cp. books at few toys lang sis..😊😊