'ir' as in stir | 'ur' as in surf

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Across
  1. 3. Next week is my _ _ _ _ _ _ _ _. I will be turning 8 years old. (8)
  2. 4. The number that comes after twelve is _ _ _ _ _ _ _ _. (8)
  3. 5. The man buttoned up his _ _ _ _ _. (5)
  4. 8. We wear a hat in summer so we do not _ _ _ _ _ _ _ our skin. (7)
  5. 10. The balloon _ _ _ _ _ when it landed on the grass. (5)
  6. 11. Remember to wear a helmet while riding a bike or you may _ _ _ _ yourself. (4)
Down
  1. 1. We must be quiet so we do not _ _ _ _ _ _ _ the baby while it is sleeping. (7)
  2. 2. We went to _ _ _ _ _ _ on Easter Sunday. (6)
  3. 6. Please wait your _ _ _ _. (4)
  4. 7. The _ _ _ _ _ letter in the alphabet is A. (5)
  5. 9. Careful not to _ _ _ _ your hand in the fire. (4)
  6. 10. I saw a yellow and black _ _ _ _ flying in the sky. (4)