How do I give my 7 month old prunes for his constipation?

Rhiannon

My LO is pretty constipated and is inly passing little hard pebble like poos and seems to strain an awful lot for such a small Poop - I couldn’t get prune juice but I have prunes in my cupboard - how can I give it to him? Blended with water ? And how much do I give him ?