I want to get my 7week old a pillow to encourage her to sleep flat on her head some. She loves to sleep on her left side and we do alternate but she tends to rotate back..

Thinking of getting this one:
http://www.amazon.com/gp/product/B001O9F6M8/ref=ox_sc_act_title_1?ie=UTF8&m=ATVPDKIKX0DER

Is it too warm for summer though? Is there another you would recommend?