Things were different with my DD as I stopped BFing at about 6 months, but she started having the odd sip of water when she started solids (although not very interested). She slowly drank a bit more as she got older but suddenly started drinking heaps at around 11 months when I brought her a sippy cup with a straw as opposed to the non-straw cup she previously had. She loved the straw and started drinking 2-3 drink bottles of water a day (not giant bottles, but still a lot). This was also the beginning of summer so that may have made a difference....