Need help to gain weight

[Puppupandaway]

My DS 17 has always been close to being underweight so it's not a new thing. However, he is looking thin and so I want to help him gain a bit of weight. Can anyone suggest snacks or meals that are healthy but full of calories? Thank you.

Try to fortify his meals so full fat milk, cheese, butter, cream mixed into mash potatoes, added to soups, stews etc. Milkshake drinks and cream added to hot chocolate. Milky based snacks and puddings such as cake and custard, ice cream etc. High calorie snacks such as pork pies, cheese and crackers, scotch eggs, crisps, nuts etc.

Also extra protein, try and make sure he's having some with every meal and snacks in between

Eggs, chicken, beans, nuts, peanut butter, cheese etc eg baby bel light has 5g protein.