Growing Up God's Way for Boys by Dr Chris Richards & Dr Liz Jones and published by Evangelical Press.
These little booklets are colourful and fully illustrated and available as separate versions for boys and girls.
They are intended for children approaching or experiencing puberty, typically represented by the 10-14 year old age range.
The artwork has been specially produced for the book and includes accurate biological drawings as well as 'cartoon' illustrations to keep the young reader interested.
Most importantly of all, the Bible is the constant reference point, so that what the Bible has to say about the matters dealt with is always front and centre.