No poop! Orange Juice in Water for 2 month old baby?

My baby is a 2 month old and breastfed.

On the recommendation of my doctor I put a drop of orange juice in some water for my baby who hadn’t pooped in 6 days. It worked within about 15 minutes – she filled her nappy. The poop was soft and light brown.

Anyway – then she didn’t go again for 7 days!! So I’ve put a small drop of orange in some water again and it cleared her out within minutes.

In those seven poopless days, I had done baby massage and ‘taking the temperature’ etc… nothing worked.

How long should I wait this time – I don’t want to keep putting juice in her water to make her bowels move – but she was getting to the point of crying and straining all of the time because she was trying to poo.

On a side note: She is getting enough liquids because she’s soaking her nappies many times a day. She’s a very content baby other than the pooping issue – it’s just when she’s trying to poo that she gets crying and straining.

Your advice is appreciated!