Interaction with toys😕

Ma
When do they start to interact with toys? I mean gradping and trying to reach them etc.
Looking at everyones post that LOs are interacting with toys makes me more worried that why My LO is not interested in any toys she will be 4 months on 27 Aug ☹️ 
I dont know if its just my crazy head making stuff up or it is the case because Even if i try to force her to move the rattles to encourage that it will make sounds . She tries so hard not to.