Child carrier system comprising: - at least one shoulder strap configured for positioning on a user's shoulder; - a dorsal support panel configured for receiving a child; - a waist belt configured to accommodate a user's waist; - fastening systems at the ends of the waist belt for attaching or detaching it around the user's waist; - fastening systems for the said at least one shoulder strap with the dorsal support panel positioned at one end of the said at least one shoulder strap; - multi-adjustable mechanisms (19, 20, 4, 4.1, 4.1.1, 4.2, 21) configured to allow a child to be always carried in the correct ergonomic position while the child is positioned in the child carrier system, the said multi-adjustable mechanisms (19, 20, 4, 4.1, 4.1.1, 4.2, 21) comprising an adjustable width system of the dorsal support panel, wherein the adjustable width system includes three circular cylinders, which are successively mounted around the waist belt of the said child carrier system and are configured to allow a wide carrying adjustability of the child carrier system, for the child to be placed in the correct ergonomic position, having support up to the back of the child's knees: two outer detachable cylinders (4.2) of said circular cylinders are detachable or partially detachable to the waist belt by means of a first connecting element such as seams, eyelets, velcro, buckles, webbing, buttons, mesh material or any other similar system; the middle one (4.1) of said circular cylinders comprises a permanently attached element (4.1.1) to the said waist belt; wherein said child carrier system further comprises shoulder strap gripping systems with the central part of the dorsal support panel which comprise: gripping elements (1 1) arranged on the other end of the said at least one shoulder strap, at least one wing arranged on each lateral side of the dorsal support panel, at least one buckle arranged on the said at least one wing, which is also configured to fasten the gripping elements, and characterised in that said child carrier system further comprises shoulder strap and waist belt fastening systems for fastening the said at least one shoulder strap with the waist belt which comprises additional buckles arranged on the outer detachable cylinders (4.2), configured to fasten with said gripping elements, and for ensuring the protection of the child's feet and the correct ergonomic position, having support up to the back of the knees. - at least one shoulder strap configured for positioning on a user's shoulder; - a dorsal support panel configured for receiving a child; - a waist belt configured to accommodate a user's waist; - fastening systems at the ends of the waist belt for attaching or detaching it around the user's waist; - fastening systems for the said at least one shoulder strap with the dorsal support panel positioned at one end of the said at least one shoulder strap; - multi-adjustable mechanisms (19, 20, 4, 4.1, 4.1.1, 4.2, 21) configured to allow a child to be always carried in the correct ergonomic position while the child is positioned in the child carrier system, the said multi-adjustable mechanisms (19, 20, 4, 4.1, 4.1.1, 4.2, 21) comprising an adjustable width system of the dorsal support panel, wherein the adjustable width system includes three circular cylinders, which are successively mounted around the waist belt of the said child carrier system and are configured to allow a wide carrying adjustability of the child carrier system, for the child to be placed in the correct ergonomic position, having support up to the back of the child's knees: two outer detachable cylinders (4.2) of said circular cylinders are detachable or partially detachable to the waist belt by means of a first connecting element such as seams, eyelets, velcro, buckles, webbing, buttons, mesh material or any other similar system; the middle one (4.1) of said circular cylinders comprises a permanently attached element (4.1.1) to the said waist belt; wherein said child carrier system further comprises shoulder strap gripping systems with the central part of the dorsal support panel which comprise: gripping elements (1 1) arranged on the other end of the said at least one shoulder strap, at least one wing arranged on each lateral side of the dorsal support panel, at least one buckle arranged on the said at least one wing, which is also configured to fasten the gripping elements, and characterised in that said child carrier system further comprises shoulder strap and waist belt fastening systems for fastening the said at least one shoulder strap with the waist belt which comprises additional buckles arranged on the outer detachable cylinders (4.2), configured to fasten with said gripping elements, and for ensuring the protection of the child's feet and the correct ergonomic position, having support up to the back of the knees. two outer detachable cylinders (4.2) of said circular cylinders are detachable or partially detachable to the waist belt by means of a first connecting element such as seams, eyelets, velcro, buckles, webbing, buttons, mesh material or any other similar system; the middle one (4.1) of said circular cylinders comprises a permanently attached element (4.1.1) to the said waist belt; gripping elements (1 1) arranged on the other end of the said at least one shoulder strap, at least one wing arranged on each lateral side of the dorsal support panel, at least one buckle arranged on the said at least one wing, which is also configured to fasten the gripping elements, and