Aw, I understand your worry, mama, but 18 months is still within the range where some kids just take their time, especially boys! One of my mum friends' son was silent until almost 2, then suddenly words just came. That said, if you're noticing he's not focusing on your voice or responding to his name, it's worth bringing it up sa doctor kaya she can check his hearing and development properly, better safe than sorry, di ba? In the meantime, keep doing what you're doing (talking, playing is perfect), and maybe try naming things during daily routines like "shoes, shirt, milk" so he hears the same words over and over. Don't stress too much yet, but definitely get a professional opinion para you can have peace of mind.