Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand..
As per your complain the white coating over the tongue along with painful red spots seems to be due to yeast infection known as
Oral Thrush and
redness of tongue and enlarged papillae are due to both thrush a causing inflammation of papillae..
As infants and toddlers have a less developed immune system therefore, they are more prone to get infected, especially by opportunist infections..
You should consult an Oral Physician or a Pedodontist and get him evaluated and in case if thrush is diagnosed you will be advised to take antifungal medications like
Candid mouth paint and taking ample of probiotics like yoghurt and garlic..
For redness and soreness of tongue you can make him gargle with numbing mouthwash containing lignocaine, suck ice and take
Ibuprofen..
Avoid hot and spicy food..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.