Most at the age of 27 week old a pet dog can eat food at the age of 2to4week old. Mouse about 2week old.
At about 3 weeks
Not yet.
Because babies don't eat solid food.
when they are at least a half year old
Until the mom has another litter, or until the baby gerbil can eat solid food.
They feed off they're mom's milk, but they can eat solid food when they are born.
Wolves regurgatate to make edible food for their cubs (baby wolves) until the cubs can eat solid food.
Baby hamsters will start to eat solid food at around 8 days old until they are gradually weaned at 21 days
My baby gerbils have already started eating sunflower seeds and drinking water and they are 25 days old.
Baby mice are introduced to food by their mothers so you should not need to interfere in anyway unless the baby mouse doesn't have a mother. I think baby mice start to eat solid food at around 2-3weeks.
At 4 to 6 weeks they should start to eat solid food and drink water.
puppies can eat solid food around 8-12 weeks after they are weaned
anyone can eat baby food but for specific info check this out http://clk-4.info/baby-food-safety