my cat purrs and sucks the blanket

A FELINE BEHAVIOR TO HIGHLIGHT, THE SUCKLING CAT
When I went to the vet he explained to me that the sucking instinct is very strong in young kittens because I adopted him before he was 4 months old and that explains this behavior, the orphaned cats can try to suck on anything soft, warm and fluffy, especially if it looks like a mother cat. This behavior can even last until adulthood, the cat sucking on objects such as a blanket, a fluffy toy or clothing. When I see him doing this it makes me sad and I try to give him affection and love a tip never adopt a kitten that is less than 3 months old