Alamak, jangan risau lah, 4 gigi at that age is totally normal! Teething timeline really varies from baby to baby, some anak I know baru dapat gigi at 14-15 months, so your little one is perfectly fine. The fact that dia dah walk at 9 bulan 22 hari and started talking early (baba, opah!) shows he's doing great overall, so gigi 4 batang tu bukan issue langsung. Setiap budak berlainan je, ada yang mula early, ada yang slow sikit but catch up later. Kalau mummy worried sangat about the pace, boleh always mention to your pediatrician at the next check-up, but honestly dari experience aku dan few mum friends, ini dalam range normal je!