My son turned 1 yesterday so it was time to throw the bottles away. Ive bought quite a few different sippy cups since he was 6 months old. I'd give him water with his meals in the sippy cup to help get him accustomed. Now that he's only on sippy cups he's had a hard time. Yesterday he only ended up drinking one bottle because he kept refusing the sippy cup. Today i bought the Nuk sippy cups shown below.

He seemed to take to this fast. He drank most of his bottles today which was good. However i did notice that it took him longer to drink them, it seemed that he had to suck harder. Is that just because he's new at drinking from it and hasn't gotten the hang of it? Are there any other sippy cups you'd recommend? Ive tried munchkin straw sippy cups, nuby no spill sippy cups, munchkin regular sippy cups, tommee tippy straw sippy cups and some other nuby sippy cups. He only took the Nuk ones i got today. Should i try another one or just stick with the Nuks for now?