How frequent should I change the bottle and teats for my lo? TIA...

Check bottle nipples often (at least every two to three months) for these signs of wear and tear: * Breast milk or formula pours out in a stream. Liquid should drip steadily out of the nipple — if it comes rushing out, the hole is too big and the nipple should be replaced. * Discoloration — this could be a sign that the nipple is deteriorating. * Thinning — this an early sign that the nipple is weakening. To test a nipple's strength, pull hard on the bulb. The nipple should rebound into its original shape. If it doesn't, throw away the nipple. * Stickiness or swelling — this could be a sign that the nipple is deteriorating. * Cracks, tears, or breaks — pieces of the nipple could break off and become a choking hazard. Reference: http://www.babycenter.com/0_bottle-feeding-when-to-replace-nipples-and-bottles_1129505.bc