Aih at 4 months, baby ni dah boleh follow things with mata, so anything with bright colours and textures work best lah! A few of us tried tummy time toys, soft rattles dengan crinkly materials, babies love the sounds and it helps with sensory development, plus mereka boleh grab things already at this age. Avoid anything with small parts obviously, and rotating toys every few days keeps them interested and tidak bored. Don't stress too much, honestly, sometimes baby prefer to just watch their hands moving and that's perfectly normal development juga