Not normal pa. That's a sign of AUTISM. Please have him checked para maagapan yan. May therapy and meds yan. Ako po nakitaan ng sign of autism/ADHD pero binalewala ng parents ko. Papansin lang daw. Ngayon po ako yung hirap sa school at lagi ako napapaaway. Pati iba po talaga kilos ko. Pa check up mo po.
If he's playing, maybe you can narrate to him the objects he's playing with. Name the colors, count the objects or make up stories. In that way he can absorb some of the things you've said.