Hilmi's Improving in talking

At seventeenth months old, Hilmi can talk to someone and spell some words (start from the middle of June). He can spell "tatu.." for say "jatuh" or spell "kuka.." for say "buka". In his progress, he can spell "ndada.." for say "tidak ada", "nanan.." for "jangan", "nyam.." for "kenyang..", etc. Even, out of our minds, he always say to us after talk with someone by phone , "papa..?" for asking someone who talks us before.
For the last thing, he follow his older sister, Nadya. Nadya always ask ummi or abi with whom did she/he talked to with says "siapa ummi ?" or "siapa bi?"
The new progress of Hilmi in talking or spelling is his ability to continue counting, from 1 to 10. Ummi teach him counting number from "satu" to "sepuluh". If ummi said, "sa..", Hilmi over with "..tu". If ummi said, "du..", he over "..wa", and soon until "sepu.." and "..lu". At the last counting, ummi give him applause, and of course it made him very happy.
Overall, Hilmi can talk something more fast than his sister, Nadya.