Fit bounds to All points leaflet

<script>
var map = new L.map('map');
L.tileLayer('http://{s}.tile.cloudmade.com/BC9A493B41014CAABB98F0471D759707/997/256/{z}/{x}/{y}.png', {
            maxZoom: 18,
            attribution: 'Map data &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="http://cloudmade.com">CloudMade</a>'
        }).addTo(map);
            var markerLayer = new L.featureGroup();

            givePoint(lat, lon){
                var latlng = new L.LatLng(lat,lon);
                marker = new L.marker(latlng, {icon: myIcon});
                marker.addTo(markerLayer);
                markerLayer.addTo(map);

                var bounds = markerLayer.getBounds();
                map.fitBounds(bounds);
            }

</script>