There are a few things of interest here.
First, it's interesting to note that we come into this world only able to survive from liquid food - our mothers milk, or more recent times, formula.
Now the adults have their own formula, Soylent, and are thinking about designing Soylent Jr, so little johnny can move from the nipple to the flask, without even having to figure out what a knife and fork are for.
In the meantime, teething.
Here's where I think it gets interesting
We still don't know what the long term effects are on things like teeth. What's the implications of a young child never seriously using thier teeth.
I personally think that whilst it might be good for nutrition there are some other things we need to consider here.
Maybe soylent should be something that's for early teens and up only, a sort of right of passage into adulthood.