My lo is 15 months no words yet, which I wasn't concerned about, but he has no understanding of simple commands, give mummy car for example, if I ask him where anything is unless it's daddy, cat or dimming he just looks aimlessly around, so contacted hv for advice they came and did an assessment, he scored 4 out of 10 so in a red area, which means he has a delay, 18 week wait for referral, could he still catch up, what does this mean for my little man?