Nice light shirts. These are the smallest 2 shirts my daughter has. Not exactly 18 months, but close. Depending on how complex your child is (mine is skinny) you can increase the size.
Adorable TABNIX Toddler Little Girlsβ Short Sleeve T-Shirts: 4-Pack Graphic Cotton Tops for Size 2-7 Years
44 Review
Stylish Woxlica E Girl Clothing: Trendsetting Graphic Print Summer Crop Top for Teen Girls
43 Review
Kid Nation Short Sleeve Crew Neck Heather Girls' Clothing for Tops, Tees & Blouses
52 Review
Shop the Comfy and Tag-Free Kid Nation Crewneck T-Shirt Collection π for Girls! Top-Notch Clothing, Tops, Tees, and Blouses for Your Little Fashionista!
45 Review