Soft hand puppets
Cloth or board books
Pretend play sets that are lightweight and can pack flat - could be fix-it tools, pretend food and dishes, doctor set
Small pillow pet or Squishmallow
Squigz/pipsquigz suction toys
Puzzles with <10-12 pieces
In general, for books, check out new releases or ask for suggestions at Politics & Prose, East City Bookshop, or another shop like that. Toy shops like Child's Play are great for recommendations too if you visit. Alternatively, you can look for baby/child products at Shop Made in DC, e.g., clothing, wall art, toys. A favorite for online shopping, and easily sorted by age:
https://www.fatbraintoys.com/index.cfm