Hi. My baby (just 8m) was breastfed to 7 months and happily takes a bottle too. At lunch and dinner he's learned to use a Doidy cup but I struggle to get him to use a beaker. We have an Avent (green bottle with rubber spout and valve) but he only wants to chew it and I end up unscrewing the top and letting him sip from it. Any tips? I know I should be trying to get him off the bottle.