No you need not. He's between 3rd and 15th centile on growth charts. As long as he continues on this same trajectory he's fine.
Next Steps
You need serial weight recording for a complete assessment. Although, very low on percentile chart ( < 3rd centile) is also concerning. Get to know and get his weight, height centiles charted 3 to 4 times a year
Health Tips
For ideal weight, you need to know his height. Weight on the same percentile as his height would be ideal. But not ideal does not necessarily mean 'abnormal'!