grafik pertumbuhan bayi

saya ingin menampilkan grafik pertumbuhan bayi sampai 12 bulan berdasarkan id penimbangan bayi.  dibawah adalah kodingan grafik saya. sudah saya coba malah tampil hanya sampai bulan maret saja. terima kasih

var ctx = document.getElementById("linechart").getContext("2d");
  var data = {
            labels: ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"],
            datasets: [
                  {
                    label: "Perkembangan Berat Badan Balita (Kg)",
                    fill: false,
                    lineTension: 1.5,
                    backgroundColor: "#29B0D0",
                    borderColor: "#29B0D0",
                    pointHoverBackgroundColor: "#29B0D0",
                    pointHoverBorderColor: "#29B0D0",
                    data: [<?php $koneksi    = mysqli_connect("localhost", "root", "", "eposyandu");
$sekaran =mysqli_query($koneksi, "SELECT berat as jumlah, berat1 as jumlah1, berat2 as jumlah2 FROM ref_penimbangan ORDER BY tanggal_penimbangan");
while ($y = mysqli_fetch_array($sekaran)){
  echo '"'.$y['jumlah'].'",', '"'.$y['jumlah1'].'",', '"'.$y['jumlah2'].'",';
}?>
  ]
                  }
                  ]
          };

  var myBarChart = new Chart(ctx, {
            type: 'bar',
            data: data,
            options: {
            legend: {
              display: true
            },
            barValueSpacing: 20,
            scales: {
              yAxes: [{
                  ticks: {
                      min: 0,
                  }
              }],
              xAxes: [{
                          gridLines: {
                              color: "rgba(0, 0, 0, 0)",
                          }
                      }]
              }
          }
        });