suggestions for slow flow beaker spouts please

[yackityyak]

I want to get my 6 month old drinking juice from a beaker rather than bottle. Trouble is all beakers flow too fast. Can anyone suggest some slow flow beakers of the traditional kind rather than the none-spill variety - I don't like these as they can't be cleaned properly and baby has to suck extremely hard to get anything out.

How about these

They don't have the straw like other non-spill one, DS found them quite easy to use. They just bite the spout and it opens the hole (it's silicone). Tommee tippee type ones just tipped all over him and he couldn't handle them. These ones are also similar to a bottle in a way, so can ease transition to a normal lidded cup.