Three stages. Stage 1, no ball and no table: rehearse the stroke path from back-low to front-high, the racket staying in the plane of the stroke. Stage 2, with a ball beside the table: the same movement onto a hand-held or tossed ball. Stage 3, at the table: the feeder plays a topspin or a no-spin ball — never backspin at this stage, because the federation states the forehand topspin is easier to learn against an incoming topspin ball.
Coaching points : Where this comes from, and what it is not. Only the German federation teaches topspin at this age: the DTTB framework opens the stroke at stage FS 2 = 8-9 and leaves it out of FS 1 = 4-7. Swiss Table Tennis places topspin two years later, at U13 = 10-12 — though its curriculum tables carry the running header "Nachwuchsförderungskonzept 2008", so treat the Swiss gate as directionally sound rather than as today's confirmed Swiss position. The J+S-Kids series never mentions topspin across its ten lessons; the FFTT's Baby Ping has no stroke curriculum at all before 7. So run this as the German route, not as settled practice, and only with the 8-9 end of the group. The DTTB's own fault list: keep the racket in the plane of the stroke, a straying elbow or wrist being the usual cause; brush the ball, never lift it by opening the blade; the feet must not be parallel to the end line or the hips and shoulders cannot rotate; the playing arm is nearly extended at the end of the backswing, otherwise the forearm contributes nothing; the free arm points at the ball on the backswing and rotates back with the hips and shoulders on the hit, keeping the torso forward and the legs low; the weight transfers, and early; contact is never behind or beside the body; the finish is neither behind nor above the head, nor at chest height.
↑ Harder : Shadow stroke, then hand-fed, then basket-fed to one fixed placement, then basket-fed to two placements, then against a partner's block.
↓ Easier : Shadow only, five repetitions at a time, mirroring the coach; slower tempo; a bigger and softer ball as in the first J+S-Kids lessons. If the table is too high for the child — the DTTB states it usually is at this age — put a mat or a platform under them.