I have not experienced this and breastfed my son till he was 14 months. Now I am breastfeeding my 3 month daughter till 14 months as well or longer. No pattern change with that but what has changed my curls to 3b is the curly girl method
[B][COLOR="Indigo"]3A/3B Curl Pattern, Low Porosity, Medium density, medium width, long length.

Favorite products: Shea moisture curl and shine shampoo, shea moisture curl and shine conditioner, Shea moisture coconut and hibiscus styling milk, Kinky curly knot today