Backrest adjustment structure for baby stroller

A backrest adjustment structure comprising:

• a housing, said housing having a top opening and a bottom hole;
• a pivot member transversely mounted inside said housing;
• two retaining blocks respectively pivotally mounted on said pivot member at two sides inside said housing, each said retaining block comprising a base pivoted to said pivot member, said base having a top side and a bottom side, a finger strip extending from the top side of said base to the outside of said housing through the top opening of said housing, and a plurality of transverse teeth arranged in parallel at said base near the bottom side of said base;
• and
• a belt fastened to the handlebar of a baby stroller and adapted to support the backrest of a seat at said baby stroller in a reclined position, said belt having two belt sections arranged together and inserted through the bottom hole and top opening of said housing between said two retaining blocks, said two belt sections each having a first end connected to each other below the bottom hole of said housing and a second end extending outwards in reversed directions outside said housing and respectively fastened to two distal ends of said handlebar;
• wherein the reversely extended second ends of the two belt sections of said belt impart a pressure to turn said retaining blocks about said pivot bolt and to further force said retaining blocks to hold down the two belt sections of said belt with the respective transverse teeth and to secure said two belt sections of said belt to said housing;
• said retaining blocks are forced to disengage the respective transverse teeth from the two belt sections of said belt for enabling the user to adjust the position of housing relative to said belt when the user pressed the finger strips of said retaining blocks toward each other.