Hi you can try OXO brand! The straw is soft and smooth for LO to drink ☺️ My son had the same issue with Lucky Bbay’s sippy bottle too but he learnt well and was able to drink better from OXO 😉
Second Richell!! My LO has been using Richell since 6mo till now (from training cup to water bottle) with no issues~
Try Avent Bendy Straw Cup- sold at Mothercare
Try Richell