My LO never cared if milk was in a bottle or sippy and I put off the complete switch, not wanting to rush things. Now I have a little monster on my hands... Whenever I give a sippy cup, I get a melt down... "no, no, mama, I bottle! bottle!" This is only at home, there are no bottles at daycare. What to do? Hope it's a short phase? Teething? LO is 17 months. Thanks!