If it was me, I would take him now, could be in poor condition for any number of reasons, I shot a Doe yearling that was 8Kg (If I remember correctly), a week earlier within 100m of that, I shot a Doe and a Doe yearling, the yearling was 14Kg, the 8Kg was clearly struggling, I suspect orphaned via RTA or Poaching, fit for dog food only.
TJ