Sea World San Antonio in Texas is a great place to vacation with your family - including the littlest members.
The water park area in Sea World itself is best for ages 10 and under, but the lack of deep pools means you can let toddlers toddle about.
The ship net play area (replica of a ship with climbing nets) is a thrill for older children while the huge sand boxes on each side are a good diversion for babies and toddlers.
The roller coasters are mostly off limits for children under 5, but the kiddie area has many diversions just for babies.
The soft shape room, shaded and netted, holds up to 20 infants and toddlers, with a soft mat floor for them to crawl about.
Sea World San Antonio actually had lots of changing tables in all the bath rooms, and adequate bathrooms in their restaurants (though not always in the bathrooms between rides).
Shamu's show is exciting for any child over one year. The other animal shows are accessible and understandable by children and babies of any age.
I also love how many indoor exhibits, like the jellyfish and aquarium, are air conditioned. Especially so in the summer.
I don't recommend the water ski show with young children. It's not interesting enough for little ones, and the motors can scare very young children.
The full fledged water park next door to Sea World San Antonio is less amenable to young children, but the full Sea World (original) part is very much designed for all ages.
Sea World San Antonio is a wonderful baby friendly (and other kids as well as adults) vacation spot.