Child Seat/trailor for Bike

[JMMM93]

My baby is 3months old next week and I'm interested in getting either a tailor or bike seat that I can put her in, when looking online I can only find ones suitable for approximately 9-12 months onwards.
Does any one have any they would recommend for a smaller child of 3 months or is it just not possible to get one for this age?

I thought they started a big bigger becaise the children have to be able to sit up to go in a bike seat? Do you get helmets for 3mth olds?

You can get hammocks that are fitted in the trailers for smaller babies however I’m not sure how I would feel about not being able to see a baby that small. You can also get bikes with a box on the front that you can fit a car seat into but I haven’t actually seen them in the UK (popular in Holland and France though).

I think it does seem that even with the baby adapters for trailors that they only seem to be safe to bike upwards of 6 months so I may have to wait. I would love to get a bike such as one in Holland, France but I have 3 already (all different disciplines) and I feel financially this isn't the right option.
Thank you for taking time to respond

I put my youngest child in a hammock in a bike trailer - didn't do it for my older children because they weren't available then. To be honest, I wouldn't recommend it particularly unless you are already enthusiastic about cycling. Towing the trailer isn't easy and they grow out of the hammock thing so quickly. By the time the nice weather comes around again, your baby will be able to sit up and go on a seat on the back or front of your bike. Much more fun for trips out and about. The trailer is good for shopping and keeping the children warm and dry though.