Emma ate 60ml. Jack ate 90ml. Same age, same weight, different needs. Twin feeding is not just double.
When I found out I was having twins, I bought two of everything. Two cribs, two car seats, two swaddles. I assumed feeding would be double too. I was wrong.
Emma was my grazer. She wanted 60ml every 2 hours, around the clock. Jack was my tanker. He wanted 90ml every 3 hours, then sleep. For the first month, I felt like I was running a diner with two customers who never wanted the same thing at the same time.
The math is different for twins. Not just double the formula — double the scheduling chaos. When one is hungry, the other is sleeping. When one spits up, the other wants more. You cannot sync them no matter what the books say. Some sync naturally. Most don't.
My survival strategy: I fed on demand but kept a loose schedule. Emma's demand was every 2 hours. Jack's was every 3. I compromised at 2.5 hours and adjusted individually. It was not perfect. It worked.
Preemie twins complicate things further. Mine were 36-weekers — not super early, but early enough to need preemie formula for 2 months. The calculations were different. The feeding volumes were smaller. The frequency was higher. I lived in 90-minute cycles for 8 weeks.
Use our Formula Calculator for each twin individually. Save separate profiles. Do not average them. Emma and Jack ended up eating the same amount by month 4, but month 1-3 were completely different.
And if you are a twin parent reading this while holding two bottles and wondering if you will ever sleep again — you will. I promise. It gets easier. Then it gets hard in new ways. But the feeding chaos does settle.