for a good head / neck control

The idea is actually really great. My Little is now 3 1/2 months and already has a good head / neck control. He may not yet be on forever and I am always with you, so that he will not let his head hang (in the truest sense of the word) and after 5-7 minutes it is for him just stand, but he is getting better. The son of a friend (8 months) remains as it also no longer, but he also has no good control. Overall, the baby already needs a certain length to also good to lie on it (my now 64 cm and it is good).
Overall, a good product.