no suggestions much - soft drinks got alot of sugar? Cerels maybe? Chocolate? Muffins? Just listing food that i enjoy, but try not to eat so i dont put on to much weight, I am just under 6ft myself, but started off weighing 90kg! So, am slightly wishing i had your problem but, there a plus's and negatives for everything i guess.
Am not sure how far along you are, but, i would let nature takes it course, and you should natuarlly put on weight as the bub grows, and fat stores start to build.
Ask you obs, gp or someone for suggestions, or see a dietatition for help.