My son began watching videos when he was 1 month. Be patient. Infants have a short attention span. If you consistently show the videos everyday your child will learn before you even notice it. This video teaches the concept of "how many". The video keeps it simple by using only the numbers 1 to 5. They count SLOW enough for babies as young as 1 month. My son started watching this video at 1 month.
My son is 18 months old now. He can count up to 9. He picks up his toy cars and counts saying: WA (1) COO (2) FEE or TEE (3) FO (4) FI (5) SEE (6) WAWA (7) AY (8) NA (9).
This happened today! He is exactly 18 months old. It really surprised me because I had no idea he had this ability. I just play the videos so I have some time to wash the dishes!
My son also watches the SEQUENCING video which shows numbers up to 10.