Though used interchangeably, growth and development mean different things. For example, when we say that Chris has grown, it could mean that he has matured or that he has grown by a few inches. The first instance relates to development, while the second refers to growth. Growth is the physical change in our body and can be quantified. For example, changes in our height, weight, waist, etc. can be measured accurately and reported. We continue to grow until a certain age and after that we stop growing. Development, on the other hand, continues throughout our life. We continue to gain experience and mature and thus develop mentally. Development cannot be measured quantitatively and can only be assessed qualitatively and hence, is a subjective measure. Physical growth is a part of our development.
Hope this helps.