Jangan risau la, 9 bulan ada banyak yang masih belum bubbling dan that's totally normal, setiap baby punya timeline dia sendiri! Anak I pun baru keluar babbling proper around 10-11 months, tapi sebelum tu dah ada sounds lain macam cooing dan giggling. Kalau dia responsive to sounds, suka dengar voice you, dan ada eye contact, those are the good signs. Tapi since this is your first, boleh la just check with the paediatrician at next visit untuk peace of mind, tak ada salah kan, especially if you're worried.