Ay mama, I understand why you're worried, nakita mo na siyang masaya before, kaya ang sudden change is really scary talaga. A few of us mum friends noticed na sometimes babies go through phases where they're quieter or less responsive, but since he was smiling and grabbing things well just last month, it's definitely worth bringing up sa pedia on Wednesday, that sudden shift is important para ma-check. In the meantime, try to stay calm kasi babies can pick up on our anxiety, at kailangan natin sila to feel secure pa rin; keep doing what you're doing with the toys and your presence, pero if you feel something is really off, don't hesitate to call your pedia today instead of waiting if it will help ease your mind. Rooting for you at your baby, mommy, Wednesday will give you answers na kailangan mo!