Taking baby liquids through security

[brewsterbudgen]

The last thread on this was from 2013 and has been archived, and it's also likely that, in light of recent events, things may be a little stricter.

We're flying to the UK next week with a 1-year old. We have a separate 'baby's bag' in which we plan to put powdered formula milk and ideally some bottles of 330ml water to mix it with, as well as some ready-mixed bottles. My research suggests that reasonable quantities of liquids over 100ml are allowed, if for a baby who is travelling. Will they need to be in a clear resealable bag? Does anyone know any different?