We all make mistakes. I know you are going to beat yourself up but it is the mistakes that will help make you the nurse you are and will become.
Peds is my soap box. It drives me nuts when I hear people say that they want to work Peds because it is easy and the babies are so cute...that they just love babies. Peds is very specialized and you must be very careful as small mistakes can have BIG consequences. The room for error is very small. The nurse who weighed the infant was at fault for not clearly labeling what the 6 was.....pounds or kilos.
I remember I was supervising and I was called to start an IV on 7 year old with septic arthritis. I started the IV and when I went to start the antibiotic I looked at the dose and about wet my pants. The dose was for a 170 lb adult....not a 70 lb child. Someone put the weight in pounds in the computer and the pharmacy thought it was Kilos. This child got the toxic antibiotic for 3 days. Thankfully there was no ill effect. The mistake was shared by all involved and all who hang the drug. It was a systems error and from that day forward in the computer, both kg and lb was displayed .........but you need to be very careful.
I always emphasize a few rules. If someone is very small....so should the dose be. When giving meds to infants, weigh them again to be sure OR/AND look at the kiddo. The rule is kilograms and if you have an infant that is 6 kilos they should be the size of a thanksgiving turkey (12 lbs) not an oven roaster that is 3 kilos or six lbs. Seem crass but it works if you have no children of your own.
I had a policy in the ED that weight needed to be verified by 2 methods scale and Broselow tape or scale twice and ask the parents and verified with another nurse/medic. So, the baby is weighed in triage. She puts 6.1 on the chart. You do the usual febrile infant w/u and are going to give meds. You get a quick Broselow measurement and ask the MOM...What does baby weigh at last check up? OR You tell MOM...follow me I want to double check babies weight before I give the medicine, to be safe. I've never had a Mom object.
YOU convert that to KG yourself, do your calculation and have your math checked. for those who don't know....The Broselow tape, which uses color-coding to approximate a weight based on the child's length, is widely used during pediatric emergencies to quickly estimate drug doses and the correct size of resuscitation equipment.
I'll make a bet you will not let this happen again and it will make you a better nurse. It's not the mistake but what you do now that makes the difference. Now beat yourself up for today. Then take a deep, breath hug yourself, make yourself a promise that this will never happen to you again.
Now forgive yourself.......it's ok. For all that we try we aren't perfect even if we try.