Carbon monoxide is an odorless, colorless, and tasteless gas that is near impossible to identify without a proper detector. It is caused by fuels not burning completely, including wood, gasoline, coal, propane, natural gas, gasoline, and heating oil.
The cause of lethargy may be suggested by its pattern and accompanying symptoms. If it starts in the morning and lasts all day, it could be due to lack of sleep or depression.
In general, toddlers should drink whole cow's milk if they don't have a milk allergy after they are 12 months old. They should then switch to reduced fat milk once they are two years old. Overweight toddlers can switch to low-fat milk even earlier though, after their first birthday.