Each child is differentso we cannot guarantee that every Filou of the same age will wear the same size. But below you can find a general overview. We approximate the sizes according to age. Tip: at the beginning of the season, we recommend buying one size more than the child is currently wearing. <div><span style="letter-spacing: 0px;"><br></span></div><p><span style="letter-spacing: 0px;">0 months= 50-56cm<br></span><span style="letter-spacing: 0px;">1 -3 months= 56-62cm&nbsp; &nbsp;<br></span><span style="letter-spacing: 0px;">3-6 months= 62-68cm<br></span><span style="letter-spacing: 0px;">6-9 months= 68-74cm&nbsp;&nbsp;<br></span><span style="letter-spacing: 0px;">9-12 months= 74-80cm&nbsp;</span></p><p><span style="letter-spacing: 0px;">1-4 months= 56-64cm<br></span><span style="letter-spacing: 0px;">4-8 months= 64-72cm<br></span><span style="letter-spacing: 0px;">8-12 months= 72-80cm</span></p>