My son is 7.5 months old and has similar situation to your bb. He has 3-4 bu bu every day after taking solid food, so I think this is caused by the solid food.
hello, my gal is almost 9 months, she is drinking the japanese brand milk powder too. Her poo comes every 2-3-4 days since she is 5 months....
I guess if the poo doesnt come out too hard and make her feel bad should be ok.
Lately, she can poo better after we gave her the vegi. you may try...
and sometimes, if the poos didnt come out by 3 days, we will give her some prune juice (for baby) and she can poos out after a day or 2.