my 3 1/2 months baby always distracted while breastfeeding, compare to last month ,now he is not much interest in drinking breast milk. is this normal?

A. Yes it is I will also give give an explanation to the thing why because after completing the age of three months a child has its proper vision is a lot of things are around to distract the child which is why this is happening this is a very common problem that every mother face is after three months