Pass value from child to parent in react

I'm having a problem and have tried several ways to solve it ... I need to get the value of the child element and pass it to the parent. Within this form, I have these plus and minus buttons (if there is no shorter than this, it puts an X).

OnthisscreenIwantedtodothefollowing,whentheuserclickedontheseplusorminusbuttons,Iwantedtogetthevalueofitandmoveontotheparentelement.ButI'mnotgettinganysuccess.

ParentElement

constructor(props){super(props);this.handleClick=this.handleClick.bind(this);}handleClick(number){console.log("NUMERO " + number);
}   

<ul>
    { 
        Object.keys(areas[item].childs).map(function(itemchild, ichild){
            return <li key={ ichild }>{ areas[item].childs[itemchild].description } <InputCounter handleClick={(number) => this.handleClick(number)} { ...areas[item].childs[itemchild] }/></li>
        })
    }
</ul>

Son Element

increment = () => {
        if(this.state.count < this.state.max_score){
            this.setState({
                count: this.state.count + 1
            });
            //Tentei passar o novo valor
            this.props.handleClick(this.state.count);
        }
    }

render() {

        return (

            <span className="input_spinner">
              <button onClick={ this.decrement } className={'minus ${ this.state.count === 0 ? "_disabled" : ""}'}></button>
              <input  type="text" placeholder={ this.state.count } disabled/>
              <button onClick={ this.increment } className={'plus ${ this.state.count === this.state.max_score ? "_disabled" : "" }'}></button>
            </span>
        );
    }

In these snippets I tried to get the value when the user increments and plays to the parent function to give the console.log in it, but I do not receive anything.