My youngest was born on the 50th centile and dropped completely off the charts altogether.
Wasn't picked up until her 8 week check and by the time paediatrics saw her and posterior tongue tie picked up she was 12 weeks. Very dangerously underweight was how the paediatrician put it, there was nowhere on the chart to even put a dot.
Feeding, I felt, was fine, she had lots of wet and dirty nappies, sucked, swallowed fine, no breastfeeding issues, fed on demand etc etc, no weighing because of pandemic. Only sign was that she just would not settle at all and all the professionals told me it was normal, just colic. The guilt I felt for ignoring my instincts and 'overconfidence' being 3rd time breastfeeding stayed with me for ages.
She was put on Similac and piled it back on, we combination fed until 28 weeks but she preferred the bottle from the start. She started thriving pretty much as soon as she transferred to formula, 10 months now and happy, healthy and exactly where she should be!
I was told that feeding was really hard work for her, so taking bigger feeds would not happen until she got stronger, ie put more weight on. She would struggle to take bigger feeds, be too hungry to sleep well, but too fatigued to fill up sufficiently. I definitely found this to be true, once she got back onto the 9th centile she started taking bigger feeds and just shot up from there.
I take it they will weigh her again and if deemed necessary they should prescribe for her?