wanting another baby and no period!

Darlene • 🎀 first baby 🎀 Fallon Marie was born 4-8-16 🎀 married for two years 💛
Wanting another baby!! My girl is seven months old and eXclusevely breast fed and has solids. I still have not gotten my period but want to start trying!! We want another one soon, but I hate to start giving her formula. Any advice??!?